Dc Gain Verification - Keysight 8990B Service Manual

Performance Verification and Adjustments 1

DC gain verification

The DC gain verification ensures the peak power analyzer gain accuracy when
measuring DC voltages. The gain accuracy measurement is made by measuring
the difference between two DC voltages and comparing the difference to the
same voltages measured by a digital multimeter. The comparison between the
two voltages is performed regardless of the 8990B offset error and ground
reference.
Required test equipment:
– 1 unit of 34401A/3458A digital multimeter
– 2 units of 10503A BNC cable
– 1 unit of 6614C DC power supply
– 1 unit of BNC tee adapter (1250-0781)
– 2 units of BNC to dual banana adapter (1251-2277)
System specification:
– DC gain accuracy: ±2% of the full scale at full resolution channel scale (±5 °C
from calibration temperature)
Test procedure
1 Assemble the test equipment as shown in Figure 1-10.
Keysight 8990B Service Guide 43