HP 3457A Service Manual page 46

Operation 3457A
AC BANDWIDTH (ACBAND) .........+e0-20eeeeeee MATH REGISTERS . ALL Cleared Except the following )
AUTO-RANGE (ARANGE) DEGREE . 20
AUTO-ZERO . OFFSET . « O
BEEP REFERENCE dB (REF) 1
CHANNELS CONNECTED (CHAN) RES . 50
DELAY ... DEFAULT (Minimum required for accuracy) SCALE . 1
DIGITS BESPLAYED: (NDIG): sciisiis mnsirseermae rsa' 5 MEMORY (MEM) ptipeaiserian tetas "ORE
DISPLAY (DISP) oN MEMORY SIZE (MSIZE) .....--e005 Previous Setting
EMASK .....-.- . 32767 enabled NUMBER OF READINGS PER TRIGGER (NRDGS) 1
ERROR REGISTER - Results of Self-Test OFFSET COMPENSATION (OCOMP) OFF
FIXED IMPEDANCE (FIXEDZ) ....--....eeeeeeeeee OFF OUTPUT FORMAT (OFORMAT) ASCII
FREQUENCY SOURCE (FSOURCE) . . + AC VOLTS PROGRAM MEMORY .......... . . . . . CLEAR
FUNCTION (FUNC) .......005 sseaeeee, DO VOLTS READING HENORY sieinesiecsateietsirta'eis slot sie Stes CLEAR
HP-IB ADDRESS .... UNCHANGED (Factory setting 22) REQUEST SERVICE (ROS) Power ON bit unchanged
INPUT BUFFER CINBUF) .....seeeeeeeeeeeeeeeees OFF SCAN ADVANCE (SADV) HOLD
INPUT TERMINALS (TERM) SCAN: LUST, CSLEST) sa seceanh wancateuaes CHANNEL 0
INTEGRATION TIME (NPLC) STATUS REGISTER . . Pwr ON bit + Self-Test results
MATH FORMAT (MFORMAT) TIMER LeeGaae 1 sec.
MATH FUNCTION (MATH) TRIGGER (TRIG) - AUTO
TRIGGER ARM (TARM) - AUTO
Table 3-1. 3457A Power-On State
3-13. Range Selection. The HP 3457A Auto-Range feature automatically selects the appropriate range to op
measure the voltage applied. The Auto-Range feature is disabled by selecting Manual Ranging. There are 5
voltage measurement ranges available; 30 mV, 300 mV, 3 V, 30 V and 300 V. The default range is
Auto-Range.
© To select Manual Ranging and maintain the present range - Press the Blue SHIFT key then the
| /HOLD scroll key.
© To select Manual Ranging and the next higher range - Press the {/AUTO scroll key.
© To select Manual Ranging and the next lower range - Press the |/HOLD scroll key.
© To return to Auto-Ranging - Press the Blue SHIFT key then the [/AUTO scroll key.
3-14. Measurement Resolution. Measurement Resolution is changed by selecting the number of digits dis-
played. You can choose a display of 3 1/2, 4 1/2, 5 1/2 or 6 1/2 di The 1/2 digit refers to the most sig-
nificant digit which is limited to a value of 0, 1, 2, or 3. The default number of digits displayed is 5 1/2
(most significant digit plus 5 digits).
© To change the number of digits displayed - Press the DIGITS DISP / P configuration key, enter the
number 3, 4, 5 or 6 and press the ENT / LAST ENTRY key.
3-15. Integration Time. The Integration time can be changed to reduce measurement noise or to permit
faster readings. The integration time is dependent upon the power line frequency and is expressed in num-
ber of power line cycles (NPLC). There are six integration times available; 100 PLC, 10 PLC, | PLC, .1 PLC,
005 PLC and .0005 PLC. The greater the PLC number, the quieter and more accurate the reading will be
and the slower the measurement speed. s
3-2