Tektronix Type 82 PLUG-IN Instruction Manual page 5

SECTION 1
CHARACTERISTICS
General Information
The Type 82 Dual-Trace Plug-in Unit extends the versa-
tility of the Type 580-Series Oscilloscopes by providing
dual-trace operation. The Type 82 contains two identical
fast-rise, high-gain, calibrated preamplifier channels. Each
channel has a basic deflection factor of 100 mv/cm. Two
integral X10 amplifiers extend the basic deflection factor to
10 mv/cm. Separate coupling, attenuation, variable gain, and
vertical position controls are provided for each channel.
The channels can be electronically switched either by the
oscilloscope sweep or at a free-running rate of approxi-
mately 100 ke or 1 mc, depending on the setting of an in-
ternal switch. Electronic switching enables the applied signals
to be observed together. The signal applied to either chan-
nel can be inverted to compare signals 180° out of phase.
Two P6008 passive X10 attenuator probes, supplied
with the Type 82, increase the input resistance from 1
megohm to 10 megohms and decrease the input capaci-
tance from 15 pf to about 7.5 pf. Below serial number 3000
the Type 82 had an input capacitance of 12 pf. without a
probe and 7 pf with a P6008 probe connected. The probes
" reduce loading of the circuit under test and provide a con-
venient means of coupling the signals from the device under
test to the unit.
Table 1-1 summarizes the system risetimes and band-
Where reference is made to a 580-series, 581 or
585 oscilloscope, the same information will apply
to the equivalent 580A series oscilloscope.
TABLE 1-1
Instrument or System | Nominal Bandwidth (de
Risetime to typical*
| 3db down
| point)
Type 580-Series Oscilloscope | 3.7 nsec; |
using the Type 84 Plug-in. always less,
Test Unit. | than 3.9 nsec. |
Type 580-Series Oscilloscope | 4.0 nsec; de to 85 mc
and Type 82; X1 Gain. always less (Also, see
than 4.2 nsec. | Fig. 1-1)
Type 580-Series Oscilloscope| 4.3 nsec; de to 80 mc
and Type 82; X10 Gain. | always less
'than 4.5 nsec.
Type 580-Series Oscilloscope | 5.0 nsec; de to 70 me
and Type 82 (Xl Gain) with | always less
Type P6008 Probe. than 5.2 nsec. ,
Type 580-Series Oscilloscope | 5.3 nsec; i de to 66 mc
and Type 82 (X10 Gain) with
Type P6008 Probe.
*Typically 3db down; never exceeds 3.5 db down at any of the
frequencies listed in the column.
than 5.5 nsec.
®
The transient response of the vertical amplifier has been
standardized in Type 581 Oscilloscopes S/N 950 and up, and
Type 585 Oscilloscopes S/N 2585 and up. (There are some
exceptions to these S/N ranges since some earlier S/N
oscilloscopes have been modified out of sequence. Your
Tektronix Field Engineer has a complete list of those which
have been modified.) The transient response of the vertical
amplifier in all Type 581A, 585A and RM585A has been
To bring an earlier serial-numbered 580 series oscilloscope
up to date for optimum performance with the Type 82, con-
tact your Tektronix Field Engineer for information concerning
modification kit number 040-275.
Calibrated Deflection Factor
Basic Deflection Factor (X1 Gain): Nine calibrated steps
are provided for each channel—0.1, 0.2, 0.5, 1, 2, 5, 10, 20,
and 50 volts per centimeter. Variable to about a 2-to-1
ratio (uncalibrated) between steps and up to approximately
100 volts cm. Below serial number 3000 there were eight
calibrated steps provided for each channel—0.1, 0.2, 0.5,
1, 2, 5, 10, and 20 volts per centimeter. Variable to about
a 2-to-l ratio (uncalibrated) between steps and up to
approximately 40 volts cm.
Extended Deflection Factor (X10 Gain}: X10 amplifiers
that switch into both channels simultaneously extend the
deflection factor of each channel to 0.01, 0.02, 0.05, 0.1, 0.2,
0.5, 1, 2, and 5 volts per centimeter. Also variable to about
a 2-to-] ratio (uncalibrated) between steps and up to approxi-
mately 10 volts cm.
Calibration Accuracy
Front-panel X1 and internal X10 adjustments are provided
for setting the gain of each channel. When accurately set,
the vertical deflection factor will be within 3% of the panel
reading for all switch positions except the 0.1 or 0.01 v/cm
position. This position can be set to 0% error by the gain
adjustments.
Input Impedance
1 megohm -+1% paralleled by approximately 15 pf.
SN 101-2999: 1 megohm +1% paralleled by approximately
Choice of ac or de coupling. With ac coupling, the low-
frequency response is approximately 15 cps (3-db) directly,
1-1