Rear Lnput Performance Tests (Standard Instrument); Dc Voltage Function; Preliminary Steps; Performance Tests (Cont'd) - HP 3457A Service Manual

Performance Tests
Frequency Counter Performance Tests Cont'd
4-38. Frequency Counter
-
Accuracy Test
4-39. Equipment Required.
A Frequency Source capable of providing
a 20 Hz
(f
.016%) and a 1 MHz
(+ .003%) sine-wave signal is required for this procedure.
1. Set the HP 3457A to the Frequency Function
(FREQ).
2. Set the Frequency Standard for a 1 volt, 20 Hz sine-wave output signal and connect it t o the HI and
LO
input terminals of the HP 3457A.
3. Use the Test Record to record the f r e q ~ ~ e n c y readings at 20 Hz and
1
MHz.
4. If either of the readings are beyond the limits specified, the instrument should be calibrated o r
repaired. Refer t o Section V of this manual f o r calibration procedures.
Rear lnput Performance Tests (Standard Instrument)
r
a S E N S E rs
W I R E )
I N P U T
r 2 W I R E )
REAR T E R M I N A L S 4 5 0 V pk M A X \
HI
LO
HI
LO
I
TO FRONT T E R M I N A L S O R *
0 A
C U R R E N T F U S E
0
L
J
Figure 4-9. Standard Instrument Rear lnput Performance Test Connections
4-40. Preliminary Steps
I. Short the Rear Input HI and LO terminals and the S 2 Sense HI and
LO terminals as shown in
Figure 4-9.
2. Select the Rear Terminal Input. (Press the TERM configuration key, enter the number 2 and press
the ENT key.
4-41. DC Voltage Function
-
Rear Terminal Offset Test
4-42. Equipment Required. A low thermal short (copper wire) is required for this procedure.
1. Set the HP 3457A to the DC Voltage function (DCV) and the number of digits displayed (DIGITS
DISP) t o six.