M1 Operating Instructions; Preliminary Information; M1 Features; Installation - Tektronix 7D12 Operator's Instruction Manual

Section 2-7012 Operators
M1
OPERATING INSTRUCTIONS
PRELIMINARY INFORMATION
M1 Features
The M1 Multifunction Module operates with the 7D12
A/D Converter unit and the readout system of a Tektronix
7000-series oscilloscope to provide the capability to meas-
ure DC voltage, resistance, and temperature. The floating
INPUT allows up to 1,000 volts elevation from ground,
with a 10 megohm input impedance on the DC volts scale.
Test leads can be used with the RESISTANCE or DC
VOLTS ranges, and a probe may be used with the DC
VOLTS or TEMPERATURE ranges. Front-panel pin con-
nectors are provided to drive external analog temperature
ind icators.
Installation
~
Extreme care should be exercised when handling the
M1 to prevent touching any part of the circuit
boards, especially the portion of the Main board
which extends beyond the metal framework of the
module. This unit contains several high impedance
circuits which can develop inter-leakage if contami-
nated by body salts or acids.
~
Avoid the use of chemical cleaning agents which
might damage the plastics used in this instrument.
Avoid chemicals which contain benzene, toluene,
xylene, acetone or similar solvents_ Recommended
cleaning agents are isopropyl alcohol or Kelite
(1
part
Kelite, 20 parts water).
The M1 is designed to operate in the 7D12 A/D
Converter unit, which can be installed in any plug-in
compartment of Tektronix 7000-series oscilloscopes.
Fig. 1-4 shows installation of the 7D12 and module.
Digital Readout Display
The output from the M 1 Multifunction Module is a DC
analog voltage. The 7D12 converts the analog voltage to a
digital readout displayed on the CRT of the mainframe.
®
Information encoded from other plug-in units is also
displayed.on the CRT. This display 'is written by the CRT
beam on a time-shared basis with the waveform display
from the other plug-in units.
The digital readout display for the M 1 will appear in the
top division of the CRT in a location corresponding to the
plug-in compartment used. There is no analog output signal
presented on the CRT; therefore, it is not necessary to
select the 7D12 and M1 with the oscilloscope Vertical or
Horizontal Mode switches.
The digital readout display ranges from 0000 to 20000,
with a > symbol for over-ranging. The measurement units
and decimal position in the display are determined by the
MODE/RANGE switch setting. When the input exceeds the
measurement range in use, the symbol> is displayed in
place of the polarity symbol.
OPERATING CHECKOUT
General
When sh ipped from the factory, the M 1 has been
calibrated to meet the Specifications listed in the M 1
Specification section and is ready to be used with a 7D12
A/D Converter and a readout-equipped Tektronix
7000-series oscilloscope.
Steps 1 through 21 of the following procedure provide
an operational check to verify satisfactory operation of the
module, 7D12, and the associated oscilloscope. This por-
tion of the procedure is intended as a quick functional
check only and should be performed each time the M 1 and
7D12 are placed in a different oscilloscope.
The remainder of this procedure demonstrates the basic
operation of the MODE/RANGE control and the front-
panel connectors; see Fig. 2-1. It is recommended that the
entire procedure be followed completely for familiarization
with the instrument. Operation of the oscilloscope is
described in the oscilloscope instruction manual.
The tolerances given for the digital readout are for units
being operated in an ambient temperature range of + 15°C
to +40°C. For operation outside of these limits, refer to the
M 1 Specification section.
2-1