HP 4262A User Manual

Model 4262A
Section III
Figure 3-1
®
TRIGGER: These pushbuttons select trig-
ger mode, INT, EXT or HOLD/MANUAL.
INT key provides internal trigger which en-
ables instrument to make repeated auto-
matic measurements. In extemal trigger
mode (EXT), trigger signal should be ap-
plied to either of following two con-
nectors: (1) EXT TRIGGER input con-
nector on the rear panel (2) 50 pin con-
nector of Option 001 or 004 on the rear
panel. HOLD/MANUAL trigger mode pro-
vides trigger signal for one measurement
cycle when this key is depressed.
LOSS: These pushbuttons select whether
D or Q value is displayed in the D/Q
display @ in capacitance or inductance
measurements.
D/Q RANGE: These pushbuttons select
ranging method for loss measurement.
AUTO: Optimum D/Q range is selected by
internal logic circuit.
MANUAL: D/Q range is fixed to a range.
Range change is done by depressing the
STEP key on the right.
CIRCUIT MODE: Appropriate circuit
mode for taking a measurement is select-
ed and set with these pushbuttons. A
parallel equivalent circuit is selected by
PRL key and series equivalent circuit by
SER key. When AUTO key is pushed, the
instrument automatically selects the appro-
priate parallel or series equivalent circuit.
FUNCTION: These pushbuttons select
electrical circuit parameter to be measured
as follows:
C: Capacitance together with dissipation
factor (D) or quality factor (Q).
L:Inductance with dissipation factor (D) or
quality factor (Q).
R/ESR: Resistance or Equivalent Series
Resistance.
ALCR: Difference in L, C,or R value be-
tween the value of the sample under test
and the internally stored value obtained
by a measurement just before ALCR key
is depressed.
LCR RANGE: These pushbuttons select
ranging method for LCR measurement.
AUTO: Optimum range for the sample
value is automatically selected.
MANUAL: Measurement range is fixed
(even when the sample connected to the
UNKNOWN terminals is changed).
Range change is done by depressing
DOWN or UP key on the right.
SELF TEST: This pushbutton performs
automatic check for checking the basic
operation of Model 4262A. If normal oper-
ation is confirmed, ‘““PASS” is displayed in
LCR display @ If wrong performance is
detected, a display of “FAIL” appears. See
paragraph 3-5 for details.
ZERO Adjustment Controls: These adjust-
ments provide proper compensation for
cancelling stray capacitance and residual
inductance which are present when a test
fixture is mounted on the UNKNOWN
terminals. Connectors are kept open for
cancelling stray capacitance and shorted
for cancelling residual inductance.
DC BIAS Selector Switch: This switch per-
mits selection of internal DC bias voltage
applied to sample (1.5Vdc, 2.2Vdc, or
6.0Vdc). When switch is set to EXT, it is
used to apply external bias voltage from
rear DC BIAS input connectors. OFF posi-
tion is selected if no bias voltage is nec-
essary.
UNKNOWN Terminals: Consist of four
terminals: High current terminal (Hcur),
High potential terminal (Hror ), Low
potential terminal (Lror ) and Low cur-
rent terminal (Lcur). A five-terminal con-
figuration is constructed by adding the
GUARD terminal (18). A three-terminal
configuration is constructed by shorting
High terminals and Low terminals together
with shorting bars. Under DC Bias opera-
tion, the high terminals have a positive
DC voltage with respect to LOW terminals.
GUARD Terminal: This is connected to
chassis ground of instrument and can be
used as Guard terminal for increasing ac-
curacy in certain measurements.
HP-IB Status Indicator and LOCAL switch.
LED lamps for SRQ, LISTEN, TALK, and
REMOTE which indicate status of interface
between the 4262A (Option 101) and
HP-IB controller. LOCAL switch enables
front panel controls instead of remote
control signals from HP-IB line.
Figure 3-1. Front Panel Features (sheet 2 of 2).
3-3

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English