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U
I
SING THE
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:
=
V
V
0
CLAMP
Where,
In normal mode, R
R1 is 330 Ω. So the pull-up to V
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
observed.
Mode
Normal
Normal
Normal
Normal
TTL Emulation
LV Emulation
*For TTL and LV modes, there is approximately a 0.35 V drop due to the Schottky diode, resulting in an actual
internal supply voltage of 4.65 V and 3.35V, respectively.
Mode
Normal
EMX-75XX Index
R
USER
+
R
R
1
USER
V
is the output voltage
0
V
is the User configured voltage
CLAMP
R
is the internal pull-up resistor
1
R
is the external load presented by the unit under test
USER
is 100 kΩ. In TTL emulation mode, R
1
CLAMP
voltage. The 300 mA sink capability of the channel still must be
CLAMP
Voltage Output
Internal Supply
Pull-Up (R
100 kΩ (R
24 V
100 kΩ (R
12 V
100 kΩ (R
5 V
100 kΩ (R
3.3 V
499 Ω (R
5 V*
330 Ω (R
3.7 V*
External Supply
V
CLAMP
is 499 Ω and in LV emulation mode,
1
is much stronger. TTL emulation mode is available for the
)
Open Circuit V
X
)
3
)
3
)
3
)
3
)
~4.64 V
2
)
~3.34 V
1
Load
R
USER
V
CLAMP
100
www.vtiinstruments.com
0
~24 V
~12 V
~5 V
~3.3 V
V
O-USER
R
USER
(
)
+
k
R
USER
31
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