MAINTENANCE
6.4.11 DC Current Calibration
Perfoti the following procedure to calibrate DCA:
NOTE
For front panel calibration, omit step 4 of the
following procedure. For IEEE-488 bus calibration,
omit step 3.
1. Select the DC AMPS function and the 3011~4 range.
2. Connect the DC current calibrator to the instrument~s
shown in Figure 6-8.
3. For front panel calibration, press SHIFT LOCAL, and
proceed as follows:
A. With the 3O.OOOOmA DC calibration point displayed
on the Model 199, set the current calibrator to out-
put +3o.OOoomA.
B. After allowing sufficient time for the nkkement
to settle, press the NEXT button. The following
message will be displayed for several seconds:
WORKING
C. With the OO.C%OmA DC~calibration point displayed,
set the current calibrator to output oO.OOOOmA.
D. After allowing sufficient ~time for the measurement
to settle, press the NEXT button. The following
message will be displayed for several seconds:
WORKING
E. The instrument will exit the calibration progmm and
return to the 30mA range.
F. Repeat the procedures in step 3 for the 3A DC range
using Table 6-8 as a guide.
4. For IEEE-488 bus calibration, proceed as follows:
A. Set the current calibrator to output 3O.OOOOrnA.
B. After allowing sufficient time for the calibrator cur-
rent to settle, send the following command over the
bus: V3OE-3XCOX.
C. Set the current calibrator to output OO.K0OmA.
D. After allowing sufficient time for the call%rator cur-
rent to settle, send the following command over the
bus: VOXCIX. Both calibration constants will
automatically be stored in E?‘ROM.
E. Repeat steps A through D for the remaining DCA
range using Table 6-8 as a guide.
Table 6-8. DC Current Calibration
199 DC Current
199 DCA Calibration Calibrator
IEEE-488
Range Point output Bus Commands
3omA 3o.oOmmA 3o.ooOOmA
V30E-3XCOX
oo.oooomA oo.oooom‘4 voxclx
3 A 3.OOooO A 3OOO.OOmA V3XClX
O.COOOO A OOOO.OOmA voxclx
Figure 6-8. DC Current Calibration Configuration
6.4.12 TRMS AC Current Calibration
Perform the following procedure to calibrate the AC AMPS
function:
NOTE
For front panel calibration, omit steppe 4 of the
following procedure. For IEEE488 bus calibration,
omit ste~p3~.-
1. Select the AC AMPS function and the 3&nA range.
2. Connect the AC current calibrator to the instrument as
shown in Figure 6-9.
3. For front~panel calibration, press SHIFT LOCAL, and
proceed as follows:
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