Recalibration For Range 3; Recalibration For Range 2 - IET Labs, Inc. RLC Digibridge 1693 User And Service Manual

1693 RLC Digibridge

5.9.4 Recalibration for Range 3

1. Connect the 374-ohm calibration resistor to
the Digibridge test fixture.
2. Enter the known parameters of the calibration
resistor as in the following example, based on
the values R = 374.06 ohms and Q = 5 ppm.
NOTES: The Digibridge will accept six digits for R, even
though only five will be displayed. The Q is associated
with "bin 00", and its value must be preceded with "-" if
the known Q is negative.
A. Select ENTER with [FUNCTION] key and
verify that measure mode is CONT.
B. Press [3][=][SHIFT][SPECIAL][1]
C. Press [3][7][4][.][0][6][=][SHIFT][NOM
VALUE]
NOTE: the calibration resistance value should appear in
the left display. The DQ in PPM indicator must he lit .
D. Press [5][=][SHIFT][BIN NO][0][0]
NOTE: the calibration Q value should appear in the
right-hand display.
3. Enable and execute the recalibration for this
range as follows. (The following keystrokes
are the same for any range.
A. Select MEASURE with the [FUNCTION]
key and TRIGGERED with [MEASURE
MODE] key.
B. P r e s s [ 1 ] [ 6 ] [ 9 ] [ 3 ] [ = ] [ 1 ] [ S H I F T ]
[CALIBRATE]
NOTE: The GO indicator being lit and a 6 in the left
and a 6 in the right displays confirm that calibration is
enabled.
C. Press START (The GO indicator remains
unlit while calibration proceeds.)
D. Keeping hands away from the test fixture,
wait until the GO indicator is lit again.
This completes recalibration of one range.
4. Select CONTINUOUS with the [MEASURE
MODE] key and check as follows that
the Digibridge operates properly with the
recalibration.
• The Digibridge should measure the calibra-
tion resistor like any ordinary resistor and
display its R and Q (ppm) values.
• The Q display can be expected to "jump" a
bit. (Precision and repeatability are in the
order of 5 ppm).
• The NO-GO indicator will probably be lit;
this is normal.
5. Disconnect the calibration resistor from the
test fixture.
142

5.9.5 Recalibration for Range 2

1. Connect the 5.97-kilohm calibration resistor
to the Digibridge test fixture.
2. Enter the known parameters of the calibration
resistor as in the following example, based
on the values R = 5.9581 kilohms and Q =
-22 ppm.
NOTES: The Digibridge will accept six digits for R, even
though only five will be displayed. The Q is associated
with "bin 00", and its value must be preceded with "-" if
the known Q is negative.)
A. Select ENTER with [FUNCTION] key and
verify that measure mode is CONT.
B. Press. [2][=][SHIFT][SPECIAL][1]
C. Press [5][.][9][5][8][1][=][SHIFT][NOM
VALUE]
NOTE: The calibration resistance value should appear
in the left display. The DQ in PPM indicator must be lit.
D. Press [-][2][2][=][SHIFT][BIN NO][0][0]
NOTE: The calibration Q value should appear in the
right-hand display.
3. Enable and execute the recalibration for this
range as follows. (The following keystrokes
are the same for any range.)
A. Select MEASURE with the [FUNCTION]
key and TRIGGERED with [MEASURE
MODE] key.
B. P r e s s [ 1 ] [ 6 ] [ 9 ] [ 3 ] [ = ] [ l ] [ S H I F T ]
[CALIBRATE]
NOTE: The GO indicator being lit and a 6 in the left
and a 6 in the right displays confirm that calibration is
enabled.
C. Press START (The GO indicator remains
unlit while calibration proceeds.)
D. Keeping hands away from the test fixture,
wait until the GO indicator is lit again.
This completes recalibration of one range.
4. Select CONTINUOUS with the [MEASURE
MODE] key and check as follows that
the Digibridge operates properly with the
recalibration.
• The Digibridge should measure the calibration
resistor like any ordinary resistor and display
its Rand Q (ppm) values.
• The Q display can be expected to "jump" a bit.
(precision and repeatability are in the order of
5 ppm).
• The NO-GO indicator will probably be lit; this
is normal.
5. Disconnect the calibration resistor from the
test fixture.
Service and Maintenance