Operators Familiarization; Introduction; Input Considerations - Tektronix DC 5010 Anleitung

Operating Instructions-DC 50 10
@
RESET
@
FILTER (20 MHz) (CHANNEL A end
When a measurement has been stopped, this
CHANNEL B)
--
pushbutton, when pressed, will initiate another single mea-
When this button is lighted, the bandwidth of both chan-
surement. If RESET is pressed while the counter is in the
nels is reduced to 20 MHz. This allows rejection of high fre-
middle of a measurement, the current measurement will be
quency noise. It may also be used when initially setting Auto
aborted and a new measurement started. RESET, while
trigger levels or RiseIFall levels for a signal with overshoot
pressed, also provides a segment test for all the front panel
or undershoot.
LEDs, including pushbuttons and annunciators.
OPERATORS FAMILIARIZATION
INTRODUCTION
General Operating Characteristics
The DC 501 0 is a programmable universal counter based
on a microprocessor system. The counter is capable of 11
measurement functions with full nine-digit resolution, plus
two specialiired functions; probe compensations (PROBE
COMP) and self-test (TEST).
The micrc~processor system automatically sets the mea-
surement gate interval, performs the necessary calculations
on the acquired data, and causes the result to be displayed
with the best possible resolution for the selected measure-
ment FUNCTION, number of averages (AVGS), and operat-
ing conditions.
Self Test Display
When power is applied, one of the error codes listed in
Table 2-1 may appear in the display window if the counter
fails its self-test routine. Refer the error code condition to
qualified service personnel.
NOTE
At power up, a signal with a large dc offset voltage
connected to the input terminals for either channel
may cause the entire input signal to be outside the
triggering level range. If this condition exists, an error
code may be displayed. If any of these conditions oc-
cur, disconnect all inputs and reapply power. This er-
ror condition can also be caused by a low level ARM
input signal during power-up.
NOPE
Refer efiror code conditions to qualified service
\
L
personnel.
Table 2-1
FRONT-PANEL DISPLAY ERROR CODES
Serial I10 Fault
Channel A
Counter Integrity
Channel B
Counter Integrity
System RAM Error U1410
System RAM Error U1610
System RAM Error U1311
ROM placement error U1610
ROM placement error U1102
31 3
320-324, 329
330-334, 339
340
341
342
361
374
ROM placement error U1201
ROM placement error U1410
ROM checksum error U1201
I
395
375
380
ROM checksum error U1610
ROM checksum error U1102
INPUT CONSIDERATIONS
381
394
Maximum Safe Input Voltage Limits
A
To avoid instrument damage, make certain that the
input voltages to the front panel connectors or rear
interface inputs do not exceed their specified limits.
See Specification section.
The outer shell of the front panel bnc connectors is
connected to earth ground through the ground con-
nection for the power module power cord.
Always use a s tep-do wn isolation transformer (less
than 15 V output) when measuring power line fre-
quencies (50 or 60 Hz).
Be careful with high- frequency, high-amplitude signals
(above 80 MHz). The front panel maximum safe input
voltage at these high frequencies is 4 V, peak- to-peak
times a ttenuator setting.