Frequency Counter - HP 3457A Service Manual

3457A Operational Verification Tests
4-Wire Ohms Operational Verification Tests Cont'd
Frequency Counter Operational Verification Tests
Figure 4-1 9. Frequency Counter Operational Verification Test Connections
4-88. Frequency Counter
-
Accuracy Test
4-89. Equipment Required. A Frequency Source capable of providing a 20 Hz (+ .01'?!1) and a I M H z
(+ .003'70) sine-wave signal is required f o r this procedure.
Table 4-28. 4-Wire Ohms Gain Test Limits
1 y e a r l i m i t s
1.
Set the HP 3457A t o the Frequency Function (FREQ).
3457A
S e t
U p
OHMF
OHMF
OHMF
3457A
I npu t
3
Kohm
3 0 Kohm
300
Kohm
H i g h
3 . 0 0 0 1 5 7 Kohm
3 0 . 0 0 1 5 7
Kohm
3 0 0 . 0 1 5 8 Kohm
90 d a y l i m i t s
2. Set the Frequency Standard f o r a 1 volt, 20 Hz sine-wave o i ~ t p u t signal and connect it t o the HI
and LO input terminals of the HP 3457A.
3457A
Range
3 Kohm
30
Kohrn
300
Kohm
Low
2 . 9 9 9 8 4 3 Kohm
2 9 . 9 9 8 4 4 Kohm
2 9 9 . 9 8 4 2
Kohm
H i g h
3 . 0 0 0 1 1 2 Kohm
3 0 . 0 0 1 1 2
Kohm
3 0 0 . 0 1 2 8
Kohm
3.
Use the Test Record t o record the frequency readings at 20 Hz and I MHz.
Low
2.999888
Kohm
29.99888 Kohm
299.9872 Kohm
4.
If either of the readings are beyond the limits specified, the instrument should be calibrated.
Refer t o Section V of this manual f o r calibration procedures.