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1693 RLC Digibridge
default and one of the selections of the [DISPLAY]
key. For purposes of simplicity, the left display will be
called the RLC and the right display called the QDR.
Read the measurement on the main displays. The
RLC display is the principal measurement, complete
with decimal point, parameter and units which are
indicated by the light spots in the upper and lower
part of the display panel. The QDR display is the sec-
ondary measurement, complete with decimal point,
parameter and units indicated. Leading zeroes before
the decimal point are automatically eliminated in most
cases by positioning of the decimal point. Otherwise,
such zeroes are blanked out.
Negative RLC. If the RLC is negative with an L or
C value displayed, the DUT reactance is opposite to
the selected parameter. Generally, you should change
parameter (usually select L instead of C or vice versa)
so that a positive L or C value display can be obtained.
See paragraph 3.3.1.
DELTA PERCENT Displays, Selected by the
[DISPLAY] Key. This presents the principal measure-
ment (RLC) in terms of a percent difference above or
below the nominal value last entered (i.e., a previously
stored reference). Use this procedure.
1. Select ENTER with the [FUNCTION] key.
2. Select appropriate parameter and units with
[EQUIVALENT CIRCUIT] and [R/Q, L/Q,
C/D, C/R or [SHIFT] R/X, G/B, Z/ANG, Y/
ANG) key.
Pressing the button multiple times changes unit
multipliers.
3. Enter the reference for delta percent by
(N)[=][SHIFT][NOM VALVEI
pressing:
in which (N) represents 1 to 6 numerical
keys and (optionally) the decimal point key,
depressed in sequence.
Confirmation is shown (up to 5 digits) on the RLC
display.
4. MEASURE with the [FUNCTION] key and
delta% with the [DISPLAY] key.
38
Observe that the RLC display will now be in percent,
not an electrical measurement unit. It is the difference
of the measured principal value from the nominal
value (the stored reference), expressed as a percent
of the nominal value.
The secondary measurement result appears in the
QDR display area, just as it would if the principal
display were VALUE.
NOTE: If you wish to see the delta% display simul-
taneously with bin sorting (data output to IEEE-488
bus), enter the bin limits first, as described in para-
graph 3.8. Then (unless the last setting of nominal
value happens to be the desired reference for percent
difference) use the above procedure for setting up
delta% displays.
DELTA RLC DISPLAY, Selected by the [DISPLAY]
Key . This selection is indicated by lighting BOTH
indicators together: VALUE and delta.%. The del-
taRLC display is a difference from the stored nominal
value, measured in the indicated electrical units, such
as ohms, millihenries , or picofarads. If RLC is nega-
tive , the measured value is less than reference. The
procedure for selecting deltaRLC displays is like the
delta% procedure , above, except that the [DISPLAY]
key is pressed repeatedly until two DISPLAY indica-
tors (together labeled deltaRLC) are lit.
The secondary measurement result appears in the
QDR display area, just as it would if the principal
display were VALUE.
Bin No. Selected by using the [DISPLAY] key. When
measurement is completed, the bin assignment will be
shown on the left (RLC) display only , as a one-digit
or two-digit number, with the following significance:
0 = No-Go because of the secondary (QDR) limit
1 = Go, bin 1
2 = Go, bin 2
... = Go, bin 3, 4, 5, ... 12, or 13, as indicated.
14 = No-go by default (suits no other bin).
Ratio Displays. The Digibridge can be programmed to
display a ratio instead of either measured value or delta
percentage. Refer to paragraph 3.3.6.
Operation
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