Tektronix 7D14, Instruction Manual

Page: 13 / 133

Operating Instructions—7D 14
Manual Gate
Storage Switch
Fig. 2-2. Manual Gate Storage switch and Display Pos adjustment.
CH A INPUT
(BNC connector)
Internal Controls
See
Fig. 2-2
Man Gate Storage
Slide switch
AC: Selects capacitive coupling to
block DC signal components.
This switch position is used for
most signal measurements.
DC: Selects direct coupling to pass
all components of the signal
from DC to the upper limit of
the unit. This switch position is
used mainly for DC and low-
frequency signals.
Input connector for external
signals.
Selects manual gate storage mode
(use with MANUAL or EXT GATE).
OFF (forward): Readout display
follows the counter.
ON (rear): Readout display is up­
dated at the end of each gate
interval.
The following First-Time Operation procedure demon­
strates the basic operation of the 7D14 controls. It is
recommended that this procedure be followed completely
for familiarization with the instrument.
NOTE
The First-Time Operation procedure along with Table
2-1 can be used to provide a confidence check of the
instrument's operation. These steps should be per­
formed each time the 7D14 is placed in a different
oscilloscope, and before each use.
Preliminary Instructions
1. Install the 7D14 in any available plug in compart­
ment of a 7000-series oscilloscope (referred to in this proce­
dure as the Indicator Oscilloscope).
2. Connect the oscilloscope to a power source which
meets the frequency and voltage requirements of the Indi­
cator Oscilloscope power supply.
3. Turn the oscilloscope power on and allow about
twenty minutes warmup time.
4. During the warmup period, set the controls as
follows:
INDICATOR OSCILLOSCOPE
Intensity Counterclockwise
Readout Off
Any controls not mentioned can be set as desired.
7D14
MEASUREMENT
INTERVAL 10 s
DISPLAY TIME Midrange
REF FREQ/CH B INT 1 MHz
TRIGGER PRESET
INPUT SENS/P-P VOLTS 1 MΩ/1 V
BW
5 MHz
COUPLING AC
Display Pos
Variable control to set the Trigger
Indicator Display vertical position.
FIRST-TIME OPERATION
General
When shipped from the factory, the 7D14 has been cali­
brated to meet the specifications listed in Section 1 and is
ready to be used with a readout-equipped Tektronix
7000-series Oscilloscope.
Digital Display Check
5. Advance the Readout control until a readout display
is observed. Adjust the oscilloscope Focus and Astigmatism
controls for a well-defined display.
6. Connect the 1 MHz signal from the EXT IN/
MONITOR connector to the CH A INPUT connector with a
BSM male to BNC female adapter and a 50-ohm BNC cable.
2-4