Specifications

1820/1822 Operator’s Manual
Section 4
Performance Verification
Introduction
This procedure can be used to verify the warranted
characteristics of the
1820 and 1822 series of
Differential Amplifiers.
NOTE
Unless otherwise noted the 1820 refers to the 1820, and
1820-PR2. 1822 refers to the 1822, and 1822-PR2.
The-PR2 models contain two complete single channel
amplifiers within a single housing. To verify the
performance of the -PR2 models, complete the entire
procedure on one channel, then repeat the procedure
with the remaining channel.
The recommended calibration interval for the model
1820 and 1822 Differential Amplifiers is one year. The
complete performance verification procedure should be
performed as the first step of annual calibration. Test
results can be recorded on a photocopy of the Test
Record provided at the end of this section.
Performance verification can be completed without
removing the instrument covers or exposing the user to
hazardous voltages. Adjustment should only be
attempted if a parameter measured in the Performance
Verification Procedure is outside of the specification
limits.
Adjustment should only be performed by qualified
personnel. Removing the covers from the instrument
may alter critical compensation adjustments, requiring
the instrument to be re-calibrated. Re-establishing these
adjustments requires the use of special calibration
fixtures. Therefore, the covers should never be removed
by the user. The Adjustment Procedure is part of this
service manual.
Test Equipment Required
Table 4-1 on the following page lists the test
equipment and accessories, or their equivalents,
which are required for performance verification of
the 1820/1822.
This procedure has been developed to minimize
the number calibrated test instruments required.
Only the parameters listed in boldface in the
Minimum Requirements column must be
calibrated to the accuracy indicated.
Because the input and output connector types may
vary on different brands and models of test
instruments, additional adapters or cables may be
required.
4-1