HP 214B User Manual

Model 214B
LED may not operate. Consequently, the user should verify
width /period settings and not rely on the LED when
operati ng at higher rates.
The output i ~ automatically re· enabled when the width /
period
relationship is adjusted for a duty cycle at or below
the allowed maximum .
3-26 CONSTANT DUTY CYCLE MODE
3-27 The constant duty cycle mode is selected by pressing
the DUTY CYCLE pushbutton, and only functions when the
internal trigger is in operation i.e. NORM mode, GATE
mode, and BURST mode if option 001 is fitted.
3-28 When operating in constant duty cycle mode, diffe·
rent duty cycle limits exist according to the rate setting.
These are:
typically 8 % fixed in the lMHz-l0MHz rate range
2.5-10 % in the .lMHz - 1MHz rate range .
.
25 - 10 % in the 10k Hz - .1 M Hz rate range.
0.1 -
10 % for all other frequency ranges.
For the two highest rate ranges, the duty cycle limits are
indicated by an illuminated LED. In those rate ranges where
the constant duty cycle can be adjusted (1 MHz and lower),
the duty cycle is set via the DUTY CYCLE range push·
buttons and duty cycle vernier.
Whereas
the settings on this vernier correspond to width
times, when the DUTY CYCLE pushbutton is released,
they are now used to set percentage duty cycle.
3-29 AMPLITUDE
3-30 The Model 214B output amplitude is determined
primarily by the AMPLITUDE pushbutton row and
Operation
AMPLITUDE vernier. Also affecting the output amplitude
are the 214B source impedance and the load impedance .
In the .3-1-3-10V amplitude ranges, the source impe'
dance is a fixed 50 ohm, and the amplitude indicated by
the pushbutton range and vernier setting is true when
operating with a 50 ohm load.
With a high
load impedance in these ranges, the front panel
amplitude indication is one·half of the actual amplitude.
On the 10-30-1 OOV ampl itude ranges, the source
impedance is selectable via the I NT LOAD pushbutton.
When this pushbutton is in the released position, a high
source impedance exists, and when depressed, a 50 ohm
source impedance is switched in . The lower amplitude scale
(10-30-100) applies when either the load or the source
impedance is high (NOTE: one 50 ohm termination must
remain). The upper scale (5-15-50) applies when both
source and load impedances are 50 ohm. When the source
impedance is high, the HIZs LED is illuminated.
3-31 POLARITY
3-32 The polarity sl ide switch is used to set the polarity
of the selected ampl itude with respect to OV. e.g. with
amplitude set to 36V and polarity set to NEG, then the
output pulse transitions between OV and -36V.
3-3
Scans by Artekmedia => 2009

HP 214B Specifications

General

Brand	HP
Model	214B
Category	Portable Generator
Language	English