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5730A
Calibration Manual
58
Table 8. DC Zero Volt Verification
Product Range
Product Setting
DMM Reading
Limits
220 mV
0 mV
±
0.5
μ
V
-.010
μ
V
±
0.5
μ
V
2.2 V
0 V
±
0.8
μ
V
-.1
μ
V
±
0.8
μ
V
11 V
0 V
±
3
μ
V
-1
μ
V
±
3
μ
V
22 V
0 V
±
5
μ
V
-1
μ
V
±
5
μ
V
220 V
0 V
±
50
μ
V
-10
μ
V
±
50
μ
V
Self-Calibrate a Fluke 752A Divider with a Fluke 8508A as the Null Detector
1. Connect the Product, 752A, and 8508A as shown in Figure 9.
2. Set the 8508A to the 200 mV dc voltage range at 7 digits, filter “ON” and
“FAST” and internal guard (external guard not selected). FAST mode updates
the reading every 1.5 seconds. This lets the reading track the adjustments
but the readings change frequently and it is somewhat noisy. FAST can be
turned off so that the readings are updated every 5.3 seconds.
3. Set the 752A MODE switch to CAL and the CALIBRATE switch to 10:1 +.
4. Set the Product to output 0 mV on the 200 mV range and push
.
5. Wait for the reading to settle (this can take several minutes) and then zero
the meter using the
Zero Rng
button.
6. Set the Product to output 20 V.
7. Wait for the reading to settle (this can take several minutes) and note the
reading. Set the CALIBRATE switch to 10:1 – and note the reading.
8. If the readings in step 7 are not the same, then adjust the BALANCE control
until they are the same. (see note 4 below)
9. Set the CALIBRATE switch to 10:1+. Adjust the 10:1 CALIBRATE adjustment
until the reading is 0
±
0.5
μ
V.
10. Set the Product to output 0 mV on the 200 mV range.
11. Set the 752A CALIBRATE switch to 100:1 +.
12. Wait for the reading to settle (this can take several minutes) and then push
the
Zero Rng
button to zero the meter.
13. Set the Product to output 20 V.
14. Wait for the reading to settle (this can take several minutes) and note the
reading. Set the CALIBRATE switch to 100:1- and note the reading.
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