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Model 3550 LCR Meter Instruction Manual Operating Instructions
Front Panel Description cont’d:
7 “UNKNOWN" Terminals Panel
Four BNC-type terminals plus one GUARD are available for making shielded or unshielded Kelvin-
type measurement connections to the DUT. Their designations and functions are summarized
below:
Table 4.3 – Unknown Terminals
Connection
Type/Description
Measurement Function
BNC L
FORCE
Low Side Current Source
BNC L
SENSE
Low Side Voltage Sense
BNC H
FORCE
High Side Current Source
BNC H
SENSE
High Side Voltage Sense
Binding Post GUARD Five-wire shielded measurements
8 "COMPARATOR LIMIT SET" Panel - [CURSOR Ź] [CURSOR Ż] [LOW] [HIGH]
When programming comparator settings, the keys in the Comparator Limit Set Panel are used to
define the DISPLAY A & DISPLAY B Comparator values. The two left most keys are the [CURSOR
Ź] or [CURSOR Ż] keys. In the comparator set mode, these cursor keys allow navigation between
the present BIN number (1-9) and DISPLAY A and DISPLAY B comparator value settings.
If a value is defined for either DISPLAY A or DISPLAY B (by pressing digits [0]~[9] while the
DISPLAY digits are blinking.) then the functionality of the [CURSOR Ź] or [CURSOR Ż] keys
extends to allow navigation of the comparator value’s decimal point location and selection of the
DISPLAY A and DISPLAY B units of measure.
The Comparator's High and Low Limit Values for DISPLAY A and DISPLAY B can be set by pressing
the [LOW] and [HIGH] Keys while in the measurement mode. Pressing either of these keys will put
the 3550 into the Comparator Limits Set Mode.
Once in the Comparator Limits Set Mode, the BIN# and values for DISPLAY A and DISPLAY B
comparator settings can be defined by using the secondary functions (blue text) of the keys
located in the CIRCUIT MODE, RANGE, DISPLAY C, and DISPLAY A-B Panels. These secondary
functions include [0]~[9], [-], [D.P.], [UNIT], and [IGNORE] commands.
NOTE: Only panels 1~9 can have comparator limit values assigned to them.
9 The "GUARD" Terminal
This terminal is connected to the chassis of the 3550. When measuring High-Impedance devices,
connect the device’s shield to this binding post.
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