Fluke 5790B, Руководство по обслуживанию

Страница: 48 / 172

5790B
Service Manual
3-10
7. Enter the Reference Standard Voltage (Vstd) into Table 3-2.
8. Set the 5730A to the first test voltage listed in Table 3-2 and set the reference
divider and the reference standard polarity to those given in the table. To
change the polarity of the reference standard, reverse the leads to the HI and
LO output. With the exception of the 220 mV range, all other characterization
points use the External Sense of the calibrator.
V = (Polarity) * (V
std
) *DividerSetting * 0.1
The formula is used to calculate the output voltage of the Product equivalent to
characterized nominal output relative to a reference cell (Fluke 732B or 732A)
and a reference divider (Fluke 752A).
Polarity
is “+1” for positive and “-1” for negative.
V
std
is the output of Fluke 732B or 732A reference cell.
DividerSetting – from the table below for each characterization level.
9. Push

.
10. Wait at least 1 minute for the reading to settle and record the reading in
Table 3-2.
11. Adjust the 5730A output voltage to achieve the DMM reading within the DMM
Final Null limit in Table 3-2.
12. Record the 5730A Error Display indication in Table 3-2 under the column
"5730A Error Display Indication to obtain Characterized Nominal Output",
with opposite sign.
13. Repeat steps 8 to 12 for the rest of the voltages given in Table 3-2. See the
note in DC Zero Test about locking the range.