VTI Instruments
34
EMX-75XX Index
EMX-7519
S
PECIFICATIONS
G
ENERAL
S
PECIFICATIONS
D
ATA
O
UTPUT
C
HARACTERISTICS
V
OUT
(high)
V
OUT
(low)
> 2 V to 60 V
< 1.5 V @ 300 mA
V
OLTAGE
R
ANGE
Internal voltage source
User
3.3 V, 5.0 V, 12.0 V, and 24.0 V
> 2 V up to 60 V
M
ODES
Immediate (Normal)
Outputs are written via software control
D
ATA
I
NPUT
C
LOCK
S
OURCES
Internal clock
U
SING THE
I
NSTRUMENT
Measurement Performance
This section discusses tips and procedures that can help maximize the actual performance realized
with the EMX-7519 and aid the user in avoiding some common pitfalls associated with making
measurements.
Warm-up Time
As the EMX-7519 doesn't require calibration and there are no adjustments for the instrument to
meet its published specifications, there is no warm up required.
Voltage Outputs
A channel output is pulled to the configured voltage through a pull-up resistor. The actual output
that will be seen by the unit under test is defined by the standard voltage divider equation:
+
=
USER
USER
CLAMP
R
R
R
V
V
1
0
Where,
V
0
is the output voltage
V
CLAMP
is the User configured voltage
R
1
is the internal pull-up resistor
R
USER
is the external load presented by the unit under test
In normal mode,
R
1
is 100
kΩ. In TTL emulation mode,
R
1
is 499
Ω
and in LV emulation mode,
R1 is 330
Ω
. So the pull-up to
V
CLAMP
is much stronger. TTL emulation mode is available for the
3.3 V and 5 V voltage levels.
If voltages higher than those provided by the equation above are desired, the User can supply a
voltage with an external power supply in conjunction with a low-value pull-up resistor to get
closer to the user’s
V
CLAMP
voltage. The 300 mA sink capability of the channel still must be
observed.