32
Step 2 - Zero PF Adjustments
a. Refer to Figure 8-1. Set the 800AE/811AE to 120V, 600VA, 0.0PF lag and 50Hz. Adjust
R116 for 0PF reading, using the corrections for the MSB-001A. Repeat the reading on the
DVM using the digital filter set for 10 samples at 7-½ digits. Remember that 10µV = 1ppm!!
b. Change the 800AE/811AE settings to 0PF leading and observe the MSB-001A output. It
should be within 20ppm of zero. If it is not adjust R116 to achieve the best compromise
between leading and lagging. Final settings should result in readings within 20ppm (200µV)
of zero.
c. Using Figure 8-1 Set-up the MSB-001A for 240V input. Set the 800AE/811AE to 240V,
1200VA, 0PF lag and 50Hz first, and then change to 0PF, leading. Adjust R117 for the best
compromise between the two. Do not change any other adjustments.
Step 3 - 1PF Adjustment
a. Using Figure 8-1, set the 800AE/811AE to 120V, 600VA, 1PF and 50Hz. Adjust R163 for
10.00000, ± any corrections at the output of the MSB-001A.
b. Now set the 800AE/811AE to 240V, 600VA, 1PF and 50Hz. Adjust R196 for 10.00000, ± any
corrections at the output of the MSB-001A.
4.3.3 Factory Adjustments
Schematic
Designator
Location
Drawing
Number
Condition of Adjustment
R47 Control Logic 08-113-001 Adjust so IB-10 triggers gate LED (811A only)
R73 CVA 08-115-001 In Standby adjust for 25mV DC as the largest
voltage either across R14, R15, R16 or R17
(08-000-001). They should all be in the range
6 to 25mV. A substantial difference usually
indicates a weak, open or shorted transistor.
R124 CVA 08-115-001 Adjust for 50mV DC across R24, 22 and 22A,
08-000-001, with no data entered.
4.4 Periodic Maintenance
The following periodic maintenance procedures are recommended.
4.4.1 Air Filter
The internal cooling fan fitted to the Series 800 Calibrator is equipped with a washable filter,
which may be removed for cleaning by removing the four domed nuts on the rear panel. It is
important that this filter is cleaned by washing, or blowing out with an air line, regularly. The exact
interval depends on the environment in which the instrument is used, but once a month is suggested
where use is outside "clean" areas. Neglect of this operation will lead to dust being circulated inside
the instrument, with possible adverse effects on reliability. There is no filter maintenance required for
the external rear panel fan assembly.
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