32
Digital Transformer Ratiometer DTR
®
Model 8510
2.
Select the OBJ and Test location using the ▼ or ▲ key and press
ENTER
.
3.
Press
ENTER
or
TEST
to store the Measurement Record.
NOTE:
• After the test is run, the new location is automatically increased
sequentially from the last stored location.
• If a given location is not available for storage, the Save field will
display N/A.
• In order to NOT STORE the Measurement Record, simply press
the
TEST
button after the measurement is completed.
5.2.2.2 Auto Mode
When
Auto
mode is selected, the instrument requires no user input.
1.
At the end of the test, the Measurement Record is stored in the loca
-
tion next to the first available location and then will store sequentially.
NOTE:
If the previously stored Measurement Record is encountered, the
Auto store mode will skip over and store the new Measurement Record
in the next available location.
5.2.3 VT/PT Excitation Current
Excitation current, displayed in milli-amperes (mA) is the RMS current
in the Primary (H) winding due to test excitation. The loading on the
Secondary (X) winding due to the DTR
®
8510 is negligible.
• The DTR
®
8510 uses a maximum of 32Vrms excitation voltage
for testing. The displayed excitation current will almost always
be a small fraction of transformer no-load excitation at full (rated)
voltage. Most transformers will require less than 100mA.
• If you are presently using a ratiometer that employs secondary
(X) side excitation (e.g. common hand-cranked instruments) in
step-up mode, the current may be much higher than what the
DTR
®
8510 displays.
• This is normal and results directly from the fact that in most
step-down transformers, the Primary (H) side has a much higher
impedance than its associated Secondary (X) winding.
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