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Model 3550 LCR Meter Instruction Manual Operating Instructions
The Comparator cont’d:
Percent Value Settings
NOTE: A condensed version of this procedure can be found in the “Quick Start Section”
Set the Nominal Value
1) Make sure that panel 1~9 is selected. Do this by pressing the [0~9] key until the desired panel
# appears on the Panel LED. Press [SHIFT] ĺ [7] to access the Comparator Functions Mode.
Either a flashing “0” or a “1” will appear on DISPLAY B. The meaning of the numbers is as follows:
0: Absolute Value Comparator Function
1: Percent Comparator Function
To change the flashing digit, press [1] ĺ [ENTER] to call the percent comparator mode and return
to the measurement mode.
2) In the measurement mode, press the [LOW] key in the Comparator Limit Set Panel. Make sure
that a panel number from 1~9 is active otherwise the comparator [HIGH] and [LOW] keys will be
disabled. The [LOW] LED will light. This will cause the 4
th
digit if DISPLAY C to flash either a “1” or
a “0”. A flashing “0” indicates the Nominal Value Set Mode. This is where the nominal value of the
measured value will be entered. High and low limits are calculated as a percent of this value. A
flashing “1” indicates the High and Low Percent Limits Set Mode. The High and Low Percent Limits
Mode requires a [HIGH] and [LOW] comparator setting. The Nominal Value Set Mode requires only
one setting. Press the [0] key to set the instrument to Nominal Value Set Mode.
3) Press the [CURSOR Ź] once. The BIN LED in the Comparator Panel will flash a numeral “1”.
Press a numeric key [1]~[9] to set the active bin number. BIN 0 cannot be used with the
comparator function. Then press the [CURSOR Ź] key once again so that the 5
th
digit of DISPLAY A
starts to flash.
4) Enter the nominal digit value of the % comparator setting. After a value has been assigned for
each digit the decimal point will start to blink. Use the [DP] key to position the decimal point and
then press the [CURSOR Ź] key to set the unit prefix of measure. Press the [UNITS] key to select
the desired prefix for the DISPLAY A, nominal value setting.
NOTE: Units of measure in DISPLAY A or DISPLAY B cannot be changed once the comparator has
been enabled. The [IGNORE] function and the equivalent circuit mode setting are also locked out.
5) After the prefix units for the nominal value have been selected, press the [CURSOR Ź] key. The
5
th
digit of DISPLAY B will begin to blink indicating that a value can be entered for the DISPLAY B
measurement. Enter a nominal value setting for DISPLAY B then press the [CURSOR Ź] key.
6) The 4
th
digit of DISPLAY C will display a blinking “0”. Press the [1] key to enter the High and
Low Percent Limits Mode.
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