3.9
Using External PT’s and CT’s
Use an external current transformer (CT) and potential transformer (PT)
to extend the measurement range of the Model 931A. If used, however, do
not exceed the input range of the instrument (refer to Chapter 4, Specifica-
tions). Using an external PT and/or CT by directly displaying measured
primary CT and PT values greatly simplifies measurement. Programming
the scaling feature of the Model 931A, whether for magnitude or phase,
effectively cancels offset errors.
To activate and configure the scaling
function, press SHIFT then SCALE. See Section 3.3.2.17 for details on
using the Scale feature.
Measure the ratio and phase error of a CT or a PT by using the
CH1/CH2 function included in the Model 931A. Press the CH1/CH2 key
to display the phase difference and magnitude ratio of the signals measured
by Channel 1 to the signal measured by Channel 2. Further discussion of
the CH1/CH2 function can be found in Section 3.3.1.17.
Example:
measure the ratio of a PT by performing the following steps:
1. Use Channel 1 to configure the Model 931A to measure the voltage
at the input of the PT.
2. Use Channel 2 to configure the Model 931A to measure the output
of the PT.
3. Apply the operating voltage to the input of the PT, and press the
CH1/CH2 key.
4. The resultant display shows the voltage at Channel 1 divided by the
voltage at Channel 2, along with the phase angle between the two.
3.10
Data Logging
The Model 931A data-logging feature greatly simplifies recording measure-
ments, either from the front panel or through the serial interface for later
review. The following paragraphs describe how to record and review data.
3.10.1
Capturing Data
Use the LOG DATA function to record four different data type measure-
ment results in internal memory. These data types are:
Standard data
includes all of the Narrow-Band and Wide-Band
parameters for Channels 1 and 2, along with Timer and Transducer
results. All logged data is tagged with the time and date. This type
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