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VTI Instruments
Measurement Performance
This section discusses tips and procedures that can help maximize the actual performance realized with the EMX-
7510 and aid the user in avoiding some common pitfalls associated with making measurements.
Warm-up Time
As the EMX-7510 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:
R
||
=
USER
V
V
+
0
CLAMP
R
(
R
1
USER
Where,
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
In normal mode, R
1
pull-up to V
is much stronger. TTL emulation mode is available for the 3.3 V and 5 V voltage levels.
CLAMP
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
300 mA sink capability of the channel still must be 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
14
R
INPUT
||
R
)
INPUT
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
T
1-1: EMX-7510 O
ABLE
is 499 Ω and in LV emulation mode, R1 is 330 Ω. So the
1
)
Open Circuit V
X
)
3
)
3
)
3
)
3
)
2
)
1
Load
R
USER
V
CLAMP
100
V
UTPUT
OLTAGES
voltage. The
CLAMP
0
~15.84 V
~7.92 V
~3.3 V
~2.47 V
~4.64 V
~3.34 V
V
O-USER
R
||
R
USER
INPUT
(
)
+
k
R
||
R
USER
INPUT
EMX-75XX Index
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