Effects Of 176 On Type 576 Controls - Tektronix 176 Instruction Manual

Operating I nstructions-176
The jacks labeled C, Band E are the collector, base and
emitter jacks, respectively. The jacks labeled CS E N SE and
ESENSE allow Kelvin sensing of voltages measured under
high current conditions. Kelvin sensing means that current
is supplied to a device under test through one set of
contacts, and the voltage is measured through another set
of contacts. This method of sensing voltage eliminates
errors in voltage measurements due to contact resistance.
CSENSE and ESENSE stand for collector sensing and
em itter sensing, respectively.
EFFECTS OF 176 ON TYPE 576 CONTROLS
Since the 176 performs a specialized measurement
function, some of the Type 576 controls, connectors and
readout, do not perform the same functions as they wou Id
under normal operating conditions. The following table lists
the Type 576 controls and their functions when the 176 is
being used with the Type 576.
TABLE 2-2
Change in Function of Type 576 Controls,
Connector and Readout When 176 is Used
Control Change in Function
READOUTILLUM
None
GRATICULE I LLUM
None
INTENSITY
None
FOCUS
None
VERTICAL
Leakage measurements can not be
made; 5 highest deflection factors
can be multiplied by 10 by pressing
176 X10 VERT button; STEP GEN
position provides 50 A/div deflec·
tion factor (with unspecified accu·
racy) when Xl0 VERT button is
pressed .
DISPLAY OFFSET None
Selector
CENTERLINE None
VALUE
HORIZONTAL
None
POSITION (Vertical None
and Horizontal)
FINE POSITION
None
(Vertical and
Horizontal)
2-4
ZERO
CAL
DISPLAY INVERT
MAX PEAK VOLTS
MAX PEAK POWER
WATTS
VARIABLE COLLEC-
TOR SUPPLY
POLARITY
MODE
LOOPING COM-
PENSATION
NUMBER OF STEPS
CURRENT LIMIT
AMPLITUDE
STEPS/OFFSET
OFFSET
OFFSET MUL T
STEPS
300
fJ.S
and 80
fJ.S
PULSED STEPS
STEP FAMILY
RATE
POLARITY INVERT
.1X MUL T
COLLECTOR SUP-
PLY VOLTAGE
DISABLED Light
None
None
None
1500 position is d isab led.
Disabled
(MAX PEAK POWER
WATTS buttons on 176 used
instead) .
None
AC position is not usable
May be set to NORM or DC (ANTI-
LOOP). LEAKAGE (EMITTER
CURRENT) position is not usable.
Has no effect on display.
None
None
5 highest current step amplitues can
be multiplied by 10 by pressing 176
X 10 STEP button.
When 176 Xl0 STEP button is
lighted, offset is pulsed.
When 176 Xl0 STEP button is
lighted, the control becomes a 100
times multiplier.
Not usable.
None
REP ON button is automatically
pressed by plastic projection on
176 rear panel.
.5X button is automatically pressed
by plastic projection on 176 rear
panel.
None
None
None
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