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Model 3550 LCR Meter Instruction Manual Operating Instructions
Front Panel Description cont’d:
[SHIFT] ĺ [2]: Test Current Set Mode cont’d:
If DISPLAY C is set to indicate test current and the 3550 is in the Measurement mode, the
current amplitude can be incremented or decremented by pressing the [UP] and [DOWN]
keys in the DISPLAY C panel. If the [UP] and [DOWN] keys are held down the instrument
will increase the speed at which the current is incremented or decremented.
The test current can be manually entered by accessing the instrument’s current set mode.
Below are instructions to manually set the test current.
Enter the Current Values
Press [SHIFT] ĺ [2] to enter the current set mode. The most significant digit in DISPLAY C
will flash indicating that a new value must be entered. Press a key from [0]~[9] to set the
value of the first digit and to proceed to set the next digit value. Once again, press a key
from [0]~[9] and proceed to the next digit.
Verify and Set the Test Current
Once all three digits have been entered, double-check the final current value. Any of the
digits may be accessed and modified by pressing the [CURSOR Ź] or [CURSOR Ż] keys and
entering a new value. Press the [ENTER] key to save the current setting and to return back
to the measurement mode. The 3550 will beep three times and will not return to
measurement mode if a programmed test current exceeds the instrument’s sourcing
capability.
[SHIFT] ĺ [3]: Averaging Set Mode
You can define the number of measurements the 3550 makes before it produces a readable
measurement. Averaging is used to stabilize the output reading and to increase the
accuracy of a reading. To set the number of averages per reading, press [SHIFT] ĺ [3].
The active average setting will be displayed on DISPLAY B. The first digit will flash
indicating that one of the numeric keys, [0]~[9] must be pressed to set the value of the
first digit. Once a value has been entered then the next digit will flash. Enter the desired
values for the three digits and press the [ENTER] key to store the new setting. The number
of averages may be set from 1~100 readings. If an illegal value is attempted the
instrument will beep three times when the [ENTER] key is pressed to indicate that the
attempted value is outside of the instrument’s acceptable range.
[SHIFT] ĺ [4]: Key Lock Mode
In the Key Lock mode, all front panel keys except the [SHIFT]" Key, [4] Key, and (in the
case that the Measurement Trigger is set to Manual) the [MAN/EXT] Key will be locked.
The Key lock mode is used to protect the 3550 settings from unintentional changes.
To access the Key Lock Mode settings, press the [SHIFT] ĺ [4] keys. A single digit, either a
“1” or a “0” will be displayed in DISPLAY B. Set the digit to “1” to lock the front panel or to
“0’ to unlock the front panel keys. Press the [ENTER] key to finalize the setting.
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