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Specifications

1. divide In Period this switch IN causes the HP 5314A to measure 1 period and display the value in microseconds this switch is used for single shot period measurements In Ratio this switch IN causes the HP 5314A to make 1 measurement and display the ratio this switch is used for single shot ratio measurements In Time Interval this switch should be pressed This programs the HP5314A to make single shot time interval measurements In Start the HP 5314A counts the input directly IO Hz to 10 MHz and displays in units With this switch IN the input is prescaled by10 and the display is in kilo units This switch MUST be used in STARTA for signals above 10 MHz SLOPE This switch setting determines which slope of the ChannelA input signal will be used as the triggering slope LEVEL A LEVEL control used in conjunction with the attenuator switch to select the relative voltage at which triggering occurs Approximately t350 millivolts is the amount varied The input amplifiers are ac coupled The actual dc level of the trigger point is unknown INPUT A BNC connector for the A channel signal input The input impedance is 1 Meg For more information on the input signal refer to Table 7 7 Specifications ATTN Channel A input signal attenuator switch Used in conjunction with the LEVEL control to set the trigger point The input signal is not affected in XI position Input signal amplitude is reduced by a factor of 20 in th
2. 4A UNIVERSAL COUNTER CHANNEL A CHAN NEL B LEVEL A L JL RATIO AB SLOPE ATTN 10 MHz IOOMHZz MAX FREQ EJ xI E 1 Hz joie 10H RESOLUTION B Ps 1M HEWLETT NOTE See Table 7 7 for specifications on all input signals concem ing bandwidth accuracy and amplitude 1 Set line switch to the ON position 2 Set COM A SEP switch to SEP position 3 Place the two function switches O0 in the OUT postion This places the HP 5314A in the Ratio A to B function 4 Connect the higher frequency signal to the INPUT A jack D Connect the lower frequency signal to the INPUT B jack the higher frequency can be input to INPUT B ifit is below 2 5 MHz 5 Set SLOPE switches Dana ATN switch and LEVEL A and B controls O and to desired positions se Table 1 1 Specifications for details 6 Press the desired sample size switch 0 0 For an explanation of the sample size switches see Figure 3 2 0 0 and CHA NEL A CHANIWELB l a EVEL A LEVEL B W E E RATO AB SLOPE ATTN SLOPE 10 MHz 1 IOOMHz MAX FREQ aS x E i 1Hz 10Hz 10H RESOLUTION 1M HEWLETT PACKARD NOTE See Table 1 1 for specifications on all input signals concem ing bandwidth accuracy and amplitude 1 Set line switch to the ON position Set COM A SEP switch O SEP position Press the FREQ A START A switch n Press the blue shift key Our position This selects the bottom function of switch O Set SLOPE ATTN an
3. 5314A UNIVERSAL COUNTER OPERATING AND SERVICE MANUAL SERIAL NUMBER PREFIX 1828A This manual applies directly to HP Model 5314A having senal number prefix 1828A and below NEWER INSTRUMENTS This manual with enclosed Manual Changes sheet applies to HP Model 5314A having senal number prefixes as listed on the Manual Changes sheets 1978 Copyright HEWLETT PACKARD COMPANY 5301 STEVENS CREEK BLVD SANTA CLARA CALIF 95050 Printed SEPT 1978 HEWLETT ND PACKARD MANUAL PART NUMBER 05314 90001 Microfiche Part Number 05314 90002 Model 5314A Safety Considerations SAFETY CONSIDERATIONS GENERAL This isa Safety Class I instrument This instrument has been designed and tested according to IEC Publications 348 Safety Requirements for Electronic Measuring Apparatus OPERATION BEFORE APPLYING POWER venfy that the power transformer primary is matched to the available line voltage and the comect fuse is installed see Section Il Make sure that only fuses with re quired rated curent and of the specified type nomal blow time delay etc are used for re placement The use of repaired fuses and the short circuiting of fuseholders must be avoided SERVICE Although this instrument has been designed in accordance with intemational safety standards this manual contains information cautions and wamings which must be followed to ensure safe operation and to retain the instrument in safe condition Ser
4. 5314A Universal Counter is a Safety Class instrument designed according to inter national safety standards This operating and service manual contains information cautions and warnings which must be followed by the user to ensure safe operation and keep the HP 5314A in safe operating condition 1 8 INSTRUMENTS COVERED BY MANUAL l 9 If the serial number prefix of your HP 5314A is lower than the serial number prefix on the title page of this manual the manual must be modified for agreement with the HP 5314A Refer to Section VII Manual Changes for the information which will adapt this manual to yourHP 5314A If the serial number prefix is higher refer to the yellow manual changes sheet located inside the front cover I lO The HP 5314A standard instrument Option 001 and Option 002 are documented in this manual The differences are noted in the appropriate locations such as Options in Section I Replaceable Parts in Section VI and Service in Section VIII l 11 INSTRUMENT IDENTIFICATION 1 12 The instrument serial number is located on the rear panel Hewlett Packard uses a two section serial number consisting of a four digit prefix and a five digit suffix A letter between the prefix and suffix identifies the country in which the instrument was manufactured A USA G West Germany J Japan U United Kingdom All correspondence with Hewlett Packard concerning this instrument should include the complete serial number l 1 Mod
5. Control switch set to SEP measurements can be made between points on separate waveforms The time interval range is 250 ns to 1 s The sensitivity is 25 mV rms 75 mV p p The resolution is 100 ns See Figures 3 5 and 3 6 for typical time interval measurement setups 3 11 INITIATING A MEASUREMENT The HP 5314A does not internally arm itself in time interval Both Channels A and B must be externally armed before a time interval measurement can be initiated see Figure 3 1 Each channel is armed by the first positive or negative edge corresponding to the slope selection setting of the input signal Channel Ais armed first Channel B ignores all input edges until Channel Ais armed Once Channel A is armed the first positive or negative edge corresponding to the slope selection setting arms Channel B Until Channel B is armed Channel A ignores any further input edges Once Channel B is armed the next dope selected edge in Channel A starts the time interval measurement and the next slope selected edge in Channel B stops the time interval measurement 31 Model 5314A Operation 3 20 OPERATING INSTRUCTIONS 3 21 General operating procedures with the HP Model 5314A Universal Counter connected in typical measurement setups are shown in Figures 3 3 3 4 3 5 3 6 3 7 and 3 8 Many other applications are possible but not shown because the general operating procedure is the same Description numbers match the numbers on the illustration 3 22
6. OPERATOR S MAINTENANCE 3 23 There is no operator s maintenance forthe HP 5314A All maintenance should be per formed by qualified service personnel only 3 24 Power Warm Up 3 25 The HP 5314A has a two position power switch STBY and ON ForHP 5314A models with Option 002 it is important that the instrument be connected to the power source in the SIBY mode when not in use This supplies power to the battery charging circuitry 3 3 Model 5314A Operation Q 5314 A UNIVERSAL COUNTER B RATIO AB 0 GATE 2 O V ERFLO W sewon osan NORM HOLD amp FREQ A START A PER A T I A gt B CHANNEL A fr fp NN EVEL A LEVEL B W SLOPE ATTN IOOMHz MAX FREQ 10 MHz P 10Hz RESOLUTION 1Hz 10Hz HEWLETT PACKARD The gate light when lit indicates the main gate isopen and a measurement is in progress LED annunciator which lights when one or more of the most significant digits digits left most from the decimal point are not displayed However the counter continues to count conectly although the digits are only corect to the extent of the time base Supplies power to the entire instrument in the ON position Supplies power only to the Option 002 battery charging circuit in the STBY postion Front panel window allowing access to the oscillator frequency adjust ment capacitor AIC2 In HOLD switch IN the measurement except for totalize in progress is stopped the main
7. P switch to SEP position Connect the input signal to INPUT A jack D Press PER A T I A B switch amp IN Make sure the blue shift key Dis in the OUT position This selects the top function of switch 5 set sope am Q ana eve A Ow desired positions see Table 1 1 Specifi cations for details gt w N 6 Press desired sample size switch 0 0 0 For an explanation of the sample size switches 00 and see Figure 3 2 Figure 3 4 Period Measurement Setup 3 8 ral 5314 A UNIVERSAL COUNTER J CHANNEL A CHANNEL B RATIO AB SLOPE aS r10 MHz on IOOMHr MAX FREQ 1 Hz 10Hr 10Hz RESOLUTION O NX AVERAGE NOTE See Table 7 7 for specifications on all input signals concem ing bandwidth accuracy and amplitude See paragraph 3 11 for time interval aming characteristics 1 Set line switch the ON position 2 St COM A SEP witch to SEP postion 3 Press PER A T 1 AB switch IN Press the blue shift key IN position This selects the bottom function of switch Connect the start time interval signal to the INPUT A jack O Connect the stop time interval signal to the INPUT B jack Q 5 Set SLOPE switches DB anc D am switch D and LEVELA and 8 contos and to desired positions see Table 7 7 Specifications for details 6 Press resolution switch QO ww IN This places the HP 5314A into single shot mode All time interval measurements made with the HP 5314A should be single shot 531
8. SEP switch to SEP position Connect the input signal to INPUT A jack O Press FREQ A START A switch Q s Be sure the blue shift key O is in the OUT position This selects the top function of switch 5 Set SLOPE ATIN O and LEVEL A to desired postions see Table 7 7 Specifi cations for details 6 Select either 1 Hz or 10 zO resolution for frequencies between 10 Hz and 10 MHz NOTE 10 Hz may also be used For frequencies higher than 10 MHz the 100MHz 10 Hz switch must be pressed IN Pe U N NOTE The following three resolutions are available with the HP 5314A but are not printed on the front panel A For 0 1 Hz resolution 10 second gate time on frequenices from 10 Hz to 10 MHz place all three resolution switches in the OUT position B For 100 Hz resolution 0 1 second gate time on frequencies to 100 MHz place switches O and i the IN position C For 1kHz resolution 0 01 second gate time on frequencies to 100 MHz place switches and in the IN position Figure 3 3 Frequency Measurement Setup Model 5314A Operation 0 5314 A UNIVERSAL COUNTER CHANNEL A L AL RATIO AB SLOPE ATTN L EL FREQ NORM A r 10 MHz IOOMHz MAX FREQ a xi a x 1Hz 10H2 10H RESOLUTION E LJ HALD sTART PER A E A B gt NOTE See Table 11 for the specifications on all input signals conceming bandwidth accuracy and amplitude l Set line switch to the ON position Set COM A S
9. counter is reset and the HP 5314A is held ready to make a new measurement The latches are not updated so the last complete measurement is displayed When switched back to NORM a new mea surement is initiated In totalize when placed in HOLD the display is held but the counters continue to increment When the HOLD is released the display is updated and resumes counting With this switch IN the HP 5314A is placed in either frequency or totalize SIART mode as determined by the position of the blue shift key With this switch IN the HP 5314A is placed in either period or time interval mode as determined by the position of the blue shift key Figure 3 2 front Panel Controls and Connectors CHANNEL B pO THIQ SHIFT KEY Q Hz N 100 Qo Hz N 10 NOTE There are two additional functions which are selected using combinations of switches and These two functions are Self Check and Ratio A to B For self check mode place both function switches and in the IN position The intrument is now making a frequency measurement on t intemal 10 MHz time base Activating switches and causes 10 MHz to be displayed Activating switch causes 100 MHz to be displayed Resolution selection switches can now be checked for proper_operation For Ratio A to B place both function switches AE the OUT position For more details on Ratio A to B refer to paragraph 3 12 and Figure 3 7 IN OUT position determines the function select
10. d LEVEL A to desired positions see Table 1 1 Specifi cations for ils T e W N 6 Connect the input signal to INPUT A ack Forinput frequencies higher than LO MHz the 100 MHz IO Hz resolution switch presale by 10 MUST be pressed IN position 5314A UNIVERSAL COUNTER TE T T RE CHA NEL A CHANNEL B 10 MHz 100MHz MAX FREQ a x a SEP STBY 1Hz 10Hz 10Hz RESOLUTION T I PUT A AN N AVERAGE 1M HEWLETT 10 11 12 14 LE NOTE This operators check checks for proper operation of the counter chip AlU2 the function and resolution switches and the display This procedure does not check the oper ation of the two input amplifiers See Figure 4 1 Operation Venfication fora more complete operational check 1 Set the line switch 3 ie the ON position 2 Depress both function switches and IN position This places the HP 5314A in the self check mode 3 Place resolution switch Qu Hz N IOO in the IN position The HP 5314A should display 0000 000 with the overflow LED ON and the instrument gating once every second 4 Place resolution switch Oo Hz N 10 in the IN position The HP 5314A should display 10000 00 with the overflow LED OFF and a 100 millisecond gate time 5 Place resolution switch 110 Hz N l in the IN position The HP 5314A should display 00800 00 with the overflow LED Oon and a l second gate time 6 Place both resolution switches 9 and in t
11. e X20 position O SEP COM A Input amplifier control switch a SEP Allows independent operation of A and B channels b COM A Operationally connects Channels A and B in parallel Used for single source time interval measurements Channel B input jack is not active The input impedance remains the same as in SEP Q INPUT B BNC connector forthe B channel signal input The input impedance is 1 Meg For more information on the input signal refer to Table 7 7 Specifications SLOPE This switch setting determines which slope of the Channel B input signal will be used as the triggering slope LEVEL B LEVEL control used to select the relative voltage at which triggering occurs When switch 16 is in SEP the trigger voltage varies approxi mately 350 mV When switch 6 in COM A the trigger voltage varies approximately 350 mV times the attenuator switch a setting The input amplifiers are ac coupled The actual dc level of the triggering point is unknown Figure 3 2 Front Panel Controls and Connectors Continued 3 6 Model 5314A Operation 5314 uNiveRSAL COUNTER CHANNEL A CHANNEL B a i 4 RATIO AB SLOPE ATTN g FREQ PER 10 MHz 100MHz MAX FREQ a ys xe NORM iHz 10Hz 10Hz RESOLUTION i LJ 2 B HALD START NOTE See Table 7 7 for the specifications on all input signals conceming bandwidth accuracy and amplitude l Set line switch to the ON position Set COM A
12. ed by keys QrQ IN position selects the bottom row functions OUT postion selects t e upper row functions NOTE The following three switches O D ar dual purpose Depending on the function selected Frequency Period Ratio etc the switches either represent the resolution and bandwidth gate time or the sample size N samples In frequency 10 Hz to 10 MHz this switch when IN gives a display with a 1 Hz resolution 1 second gate time For frequencies between 10 MHz and 100 MHz see the explanation for switch In period this switch when IN causes the HP 5314A to measure 100 periods and display the average value in microseconds In ratio this switch when IN causes the HP 5314A to make 100 measurements and display the average ratio This switch does not improve accuracy beyond 100 nanoseconds for time interval measurements In frequency 10 Hz to 10 MHz this switch when IN gives a display with a 10 Hz resolution 100 millisecond gate time For frequencies between 10 MHz and 100 MHz see the explanation for switch In pernod this switch when IN causes the HP 5314A to measure 10 periods and display the average value in microseconds In ratio this switch when IN causes the HP 5314A to make 10 measure ments and display the average ratio This switch does not improve accuracy beyond 100 nanoseconds for time interval measurement NOTE There is another resolution available using switches and in addition to the two
13. el 5314A General Information Table 1 1 INPUT CHARACTERISTICS Range Channel A 10 Hz to 100 MHz Channel B 10 Hz to 2 5 MHz Sensitivity Channel A 25 mV rms to 100 MHz 75 mV peak to peak minimum pulse with 5 ns Channel B 25 mV rms to 2 5 MHz 75 mV peak to peak minimum pulse width of50 ns Coupling AC Impedance 1MQ NOMINAL shunted by less than 30 pF Attenuator XlorX20 NOMINAL A Channel only Trigger Level Continuously variable 350 mV times attenuator setting around average valueos signal Slope Independent selection of or slope Channel Input Selectable SEPARATE or COMMON A Damage Level XI DC to 100 kHz 350V DC peak AC 100 kHz to 5 MHz 2 5X107C X Hz Product Above 5 MHz 5V rms x20 DC to 1 MHz 350V DC Peak AC 1 MHz to 50 MHz 2 5X108V X Hz Product Above 50 MHz 5V rms FREQUENCY A Range 10 Hz to 10 MHz direct count 10 Hz to 100 MHz prescaled by 10 LSD Displayed Direct count 0 1 Hz 1 Hz 10 Hz switch selectable Prescaled 10 Hz 100 Hz 1 kHz switch selectable Resolution LSD Accuracy LSD time base error X FREQ PERIOD A Range 10 Hz to 2 5 MHz LSD Displayed 100 PS for N I to 1000 in decade steps of N Resolution l LSD 1 4X Trigger Error Accuracy Trigger Error time base error X PER TIME INTERVAL A TO B Range 250 ns to1s LSD Displayed 100 ns Resolution LSD START Trigger Error STOP Trigger Error Accuracy LSD START Trigger Error STOP Trigger Er
14. g Charging cir cuitry included with option Batteries not charged during instrument operation Battery Voltage Sensor Automatically shuts instru ment off when low battery condition exists line Failure Protection Instrument automatically switches to batteries in case of line failure Weight Option 002 adds I 5 kg 3 3 Ibs to weight of instrument DEFINITIONS Resolution Smallest discernible change of measure ment result due to a minimum change in the input Accuracy Deviation from the actual value as fixed by universally accepted standard of frequency and time Trigger Error v 80 uV 2 en2 Input Slew Rate at Trigger Point uV s rms Where en is the ms noise of the input for a 100 MHz bandwidth on Channel A and a 10 MHz bandwidth on Channel B LSD Least Significant Digit Model 5314A General Information l 13 This instrument has a two part serial number The first four digits and the letter comprise the serial number prefix The last five digits form the sequential suffix that is unique to each instrument The contents of this manual apply directly to instruments having the same serial number prefix es as listed under SERIAL PREFIX on the title page 1 14 An instrument manufactured after the printing of this manual may have a serial prefix that is not listed on the title page This unlisted serial prefix indicates that the instrument is different from those documented in this manual The manual for this instru
15. ges and resolution for frequency period time interval ratio A B totalize A and self check functions 3 5 Frequency Measurements 3 6 All frequency measurements are made through the A channel input The frequency range is 10 Hz to 10 MHz direct count and IO Hz to 100 MHz prescaled by 10 with a minimum input level of 25 mV rms or 75 mV p p with a minimum pulse width of 5 ns times the attenuator setting The resolution is 0 1 Hz for frequencies up to IO MHz With frequencies above 10MHz prescale mode the resolution is 10 Hz See Figure 3 3 for a typical frequency measurement setup 3 7 Period Measurements 3 8 All period measurements are made through the A channel input The signal can be a sine wave square wave or a wave form with components faster than IO Hz The period range is 100 ms to 400 ns 10 Hz to 2 5 MHz The sensitivity is 25 mV rms or 75 mV p p The resolution is 100 ns See Figure 3 4 for a typical period measurement setup 3 9 Time Interval Measurements 3 10 The counter measures time intervals from Channel A to Channel B that is Channel A starts the measurement and Channel B stops the measurement Time between points on a single waveform can be measured by connecting the input signal to CHANNEL A jack and placing the Input Amplifier Control switch to COM A Under these conditions the slope and level controls of Channel A and Channel B allow variable triggering on either the or slope With the Input Amplifier
16. he IN position The HP 5314A should display 100000 0 with the overflow LED O OFF and a 100 millisecond gate time 7 Place both resolution switches and in the IN position The HP 5314A should display 100000 with a lO millisecond gate time
17. ing voltage factory set at 230V nominal 190V to 250V ac For field installation of Options 001 and 002 refer to paragraph2 14 Installation of Options 001 and 002 1 3 Model 5314A General Information I 20 EQUIPMENT SUPPLIED I 21 Table 1 2 lists the only equipment supplied with the HP 5314A Table 7 2 Equipment Supplied DESCRIPTION HP PART NO Detachable Power Cord 229 cm 714 feet long 8120 1 378 l 22 RECOMMENDED TEST EQUIPMENT I 23 The test equipment listed in Table 7 3 is commended for use during performance tests adjustments and troubleshooting Substitute test equipment may be used if it meets the required charactenstics listed in the table Table 7 3 Recommended Test Equipment Instrument Type Required Characteristics HP Model No Recommended Test Oscil lator 10 MHz 25 mV ms 651A Signal Generator 100 MHz 25 mV ms 8654A 50 ohm Termination 100 MHz bandwidth Digital Voltmeter IO volts Oscilloscope 100 MHz V 5 mV H 50 ns Function Generator 2 55 MHz 25 mV ms 1 4 Model 5314A Operation SECTION Ill OPERATION 3 l INTRODUCTION 3 2 This section provides complete operating information needed forthe HP 5314A Universal Counter This section includes a description of all front panel controls connectors and indi cators operating instructions operator s checks and operator s maintenance 3 3 OPERATING CHARACTERISTICS 3 4 The following paragraphs describe the operating ran
18. ment is supplied with a yellow Manual Changes supplement which contains change information that documents the differences Il 15 DESCRIPTION 1 16 The HP 5314A is a 100 MHz 100 ns Universal Counter It features a seven digit seven segment LED display with overflow indication seven function performance and full input signal conditioning There are two options available for the HP 5314A They are a Temperature Compensated Crystal Oscillator TCXO Option 001 and a battery pack for portable operation Option 002 l 17 The seven functions are Frequency Single Shot Period Period Average Time Interval Totalize Ratio and Self Check This is accomplished by a single LSI integrated circuit The input signal is AC coupled and can be conditioned as follows slope selection trigger level and attenuation l 18 OPTIONS l 19 The following is a list of options available for the HP 5314A Universal Counter NOTE A full description of the options is given in Table 7 7 Specifi cations For more information concerning the options for the HP 5314A contact your local HP Sales and Service Office A list of HP Sales and Service offices is provided at the end of this manual Option Description 001 High Stability Time Base TCXO 002 Battery with built in charger NOTE One of the following options must be included with each order Option Description 115 Line operating voltage factory set at 115V nominal 86V to 127V ac 230 Line operat
19. resolutions called out on the front panel It is 0 1 HazZN1000 This is generated when switches Q and Q in the OUT postion In fre quency 10 Hz to TM MHz with these three switches out the HP 5314A gives a display with 0 1 Hz resolution 10 second gate time For frequencies between 10 MHz and 100 MHz see the explanation for switch In period with these three switches out the HP 5314A measures 1000 perods and displays the average value in microseconds In ratio with these three switches out the HP 5314A makes 1000 measurements and displays the average ratio This switch combination does not improve accuracy beyond 100 nanoseconds for time interval measurements Figure 3 2 Front Panel Controls and Connectors Continued Model 5314A Operation 3 5 Model 5314A Operation by 10 prescaler circuit when FREQ A START A switch isin This switch MUST be used for frequencies between IO MHz and 100 MHz In fre quency this switch when IN prescales the input signal by 10 and gives a display with a 10 Hz resolution prescale by 10 with a I second gate time This switch and switch 1Hz N IOO IN prescales the input and gives a display with a 100 Hz resolution prescale by IO with a 100 millisecond gate time This switch and switch IO Hz N 10 IN prescales the input and gives a display with a 1 kHz resolution prescale by 10 with a lO millisecond gate time 10 Hz N 1 This switch when IN reroutes the Channel A input eh OiT
20. ror time base error X TI Time Interval measurements require an arming signal for both the START and STOP Channels See Paragraph 3 11 RATIO Range 10 Hz to 10 MHz Channel A 10 Hz to 2 5 MHz Channel B 1 2 Specifications LSD Displayed 1 part in A xy N in decade steps ofN for N l to 1000 Resolution LSD B Trigger Error X FREQUENCY A N Accuracy 1 count of A B Trigger Error X FREQUENCY A TOTALIZE A Range 10 Hz to 10 MHz Resolution 1 count of input GENERAL Check Counts internal 10 MHz Oscillator Display 7 digit amber LED display with gate and over flow indication Maximum Ssmple Rate 5 readings per second Operating Temperature 0 to 50 C Power Requirement 100 120 230 240V rms 5 l0 48 66 Hz 10 VA maximum Weight 2 0 kg 4 4 Ibs Dimension 238 mm wide X 98 mm high X276 mm long 938 X 33 X 107 in TIME BASE Frequency 10 MHz Aging Rate lt 3 parts in 107 per month Temperature lt 1 part in 105 0 to 50 C line Voltage lt 1 part in 107 for 10 variation OPTIONS Option 001 High Stability Time Base TCXO Frequency 10 MHz Aging Rate lt 1 part in 107 per month Temperature lt 1 part in 106 0 to 40 C line Voltage lt 1 part in 108 for 10 variation Option 002 Battery Type Rechargeable lead acid sealed Capacity TYPICALLY 8 hour of continuous operation at 25 C Recharging Time TYPICALLY 16 hours to 98 of full charge instrument nonoperatin
21. vice and adjustments should be performed only by qualified service personnel Any adjustment maintenance and repair of the opened instrument under voltage should be avoided as much as possible and when inevitable should be camed out only by a skilled person who is aware of the hazard involved Capacitors inside the instrument may still be charged even if the instrument has been disconnec ted from its source of supply Whenever it is likely that the protection has been impaired the instrument must be made in operative and be secured against any unintended operation Model 5314A General Information SECTION GENERAL INFORMATION lL INTRODUCTION l 2 This manual provides information pertaining to the installation operation testing adjust ment and maintenance of the HP Model 5314A Universal Counter Figure 1 1 shows the HP 5314A with the supplied equipment l 3 This operating and service manual is divided into eight sections each covering a particular topic for the operation and service of the HP 5314A The eight sections are listed here Section Topic General Information lI Installation IlI Operation IV Performance Tests V Adjustments VI Replaceable Parts VII Manual Changes VIII Service 1 4 SPECIFICATIONS l 5 Instrument specifications are listed in Table 7 7 These specifications are the performance standards or limits against which the instrument may be tested 1 6 SAFETY CONSIDERATIONS l 7 The HP

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