Keithley 3910 Operator's Manual page 11

SECTION 1
General
Information
The Model 3910 Function Synthesizer can generate fre-
quencies between O.lmHz and IMHz. The Model 3910
can generate the entire band at a resolution of O.lmHz,
with a high-frequency accuracy of SOppm.
~ i v e ~ ~ waveforms, sine
%,
hiangle%, squaren, ris-
ing sawtooth
A,
and falling s a w t o o d are available. A
maximum o f f lOV
DC
can be added onto each output.
Maximum output voltage for all waveforms
is
20V p-p/
no load or 10Vp-p/SOQ load.
Since frequencies are synthesized directly by a custom
LSI digital IC, accuracy and stability are high, and the fre-
quency switching time is short. Another advantage is the
continuity of phase at frequency switchover.
In addition to continuous oscillation, burst oscillation,
trigger oscillation, and gate oscillation are available. The
Model 3910 also provides a continuous output of direct
current voltage. An external trigger input provides an ex-
ternal trigger signal during trigger or gate oscillation. The
square-wave duty cycle is also variable.
The Model 3910
uses
a single line,
1 1
-character
LED
dis-
play to display the values
of oscillation frequency, pa-
rameters, and other values. Settings are easily made us-
ing push-button keys and rotary knobs.
A GPIl3 (IEEE488) interface
is
available as an option for
the Model 3910. With the exception of the A m , arn-
plitude setting; DC
OFFSET,
added quantity setting; and
DUTY
VAR, duty ratio setting; a GPIB equipped Model
3910 can be programmed over the bus for the same oper-
ating modes and parameters that can be controlIed from
the front panel.
1.2
FEATURES
Wide bandwidth: O.lmHz to lMHz (resolution
0.lmHz).
M0 ppm frequency accuracy.
Phase continuity at frequency switchover.
Five AC waveforms available:
%,%,L
,
A,
and\
The duty cycle can be set to values between 10% and
90% for frequencies up to 100kH.z.
High output: 20Vp-p/no load,
f
OVp-p/SOSUoad.
Low distortion: 0.3% or less (loHz to 100kHz).
DC output voltages available: klOV/no load,
fiV/50Q load.
Burst oscillation mode: Repeats oscillation of wave
number
specified by mark wave (1-16) and space wave
number (1-16).
Trigger oscillation and
gate
oscillation:
Trigger source: External by front panel BNC plug or
push-button key.