PXI-6683H Specifications

These specifications apply to the PXI-6683 Series the PXI-6683H unless otherwise noted.

Definitions

Warranted specifications describe the performance of a model under stated operating conditions and are covered by the model warranty.

Characteristics describe values that are relevant to the use of the model under stated operating conditions but are not covered by the model warranty.

  • Typical specifications describe the performance met by a majority of models.
  • Nominal specifications describe an attribute that is based on design, conformance testing, or supplemental testing.

Specifications are Characteristics unless otherwise noted.

PXI-6683 Specification Conditions

Specifications are valid for the range 0 °C to 55 °C unless otherwise noted.

CLKOUT Characteristics

Output frequency[1]

10 MHz

Duty cycle distortion[2]

<1%, typical

Output impedance

50 Ω, nominal

Output coupling

AC

PXI_CLK10 to CLKOUT delay

8 ns, typical

Load Square Wave
Open Load 5 Vp-p, typical
50 Ω Load 2.5 Vp-p, typical

Square wave rise/fall time (10 to 90%)

<1 ns, typical

PFI<0..2>

Output Characteristics

Frequency range

DC to 50 MHz

Output impedance

50 Ω, nominal

Output coupling

DC

Output voltage levels

Output high

1.2 V min, 1.6 V typical for 50 Ω load to ground

2.6 V min, 3.3 V typical for 1 MΩ load

Output low

0.1 V max, 0 V typical for 50 Ω load to ground

0.1 V max, 0V typical for 1 MΩ load

Absolute maximum applied voltage[3]

0 to 4.4 V

Output-to-output skew, asynchronous PXI_Star to PFI routes[4]

<400 ps, typical

Output-to-output skew, other asynchronous routes

<1.5 ns, typical

Output-to-output skew, synchronous routes

<2 ns, typical

Synchronized trigger clock to out time, tco

10 ns, max (relative to CLKOUT when configured to route PXI_CLK10)

Output current

±48 mA, max

Square wave rise/fall time (10 to 90%) for 50 Ω load

<1 ns, typical

Input Characteristics

[5]

Frequency range

DC to 50 MHz

Input impedance

1kΩ, nominal

Input coupling

DC

Nominal voltage level

0 to +3.3 V, +5V tolerant

Absolute maximum input voltage[6]

-0.5 V to +6.0 V

Input thresholds

Voltage threshold high

+2.3 V max

Voltage threshold low

+0.8 V min

Asynchronous delay, tpd

PFI<0..2> to PXI_TRIG<0..7> output

17 to 20 ns, typical

PFI<0..2> to PXI_STAR<0..12> output[7]

12 ns, typical

Synchronized trigger input setup time, tsetup

25 ns, max (relative to CLKOUT when configured to route PXI_CLK10)

Synchronized trigger input hold time, thold

0 ns (relative to CLKOUT when configured to route PXI_CLK10)

IRIG-B Input Characteristics (PFI0)

IRIG-B AM compatibility

IRIG-B 12X (200-04 standard)

Maximum Input voltage range

-5 V to +5 V

Decode Input voltage range

1.5 V to 10 V peak-peak mark (3:1 ration mark:space)

Input carrier frequency

1 kHz

Caution Do not connect an IRIG-B AM signal to PFI 0 when the input is configured for digital operation, as this can result in damage of the digital input circuitry.

IRIG-B DC compatibility

IRIG-B 00X (200-04 standard)

Input characteristics for IRIG-B DC

same as PFI digital input characteristics listed above

The following assumptions are made regarding the received IRIG-B signal. All conditions must be met for the PXI-6683 Series to be able to synchronize accurately:

  • Seconds begin every minute at 0, increment to 59, and then roll over to 0.
  • Minutes begin every hour at 0, increment to 59, and then roll over to 0.
  • Hours begin every day at 0, increment to 23, and then roll over to 0.
  • Days begin every year at 1. Days increment to 365 in non-leap years, or to 366 in leap years, and then roll-over to 1. Leap years must be supported. Valid values for year are 01 to 99, inclusive. Years are assumed to be in the XXI Century. For instance, year 09 represents 2009. If the year is not supplied (sent as 00), the OS system time is read and the year is derived from it.

To achieve proper synchronization of the NI PXI-6683 Series ensure that the IRIG-B source used conforms to the requirements listed above. Note that most IRIG-B sources conform to these requirements.

PXI Trigger Characteristics

Output-to-output skew[8]

<5 ns, typical

Asynchronous delay, tpd

PXI_Trig<0..7> to PFI<0..2>

13 to 23 ns, typical

Timestamping and Time-Synchronized Clock Generation

Time-synchronized clock period and duty cycle resolution

10 ns

Note Clock signals generated on PFI, PXI_Star (PXI-6683 only), or PXI Trigger lines must have a period and duty cycle that is a multiple of 10 ns.

Minimum pulse width for timestamping

22 ns

TCXO Characteristics

Frequency

10 MHz

Initial accuracy

±1 ppm

Temperature stability (0 to 55 °C)

±1 ppm

Tuning range

±17.5 ppm minimum

Aging per year

±1 ppm

Duty cycle

45 to 55%

GPS Characteristics

DC voltage output for antenna

+5 V, ±5%

Maximum output current

60 mA

Minimum current for antenna presence detection

4.7 mA typical, 7.9 mA max

Input impedance

50 Ω, nominal

GPS receiver type

50 channels, GPS L1 frequency (1575.42 MHz), C/A Code

Recommended signal strength at SMB connector

-130 dBm

Maximum RF power at input

+3 dBm

Accuracy

PPS[9]

15 ns

Position[10][11]

2.5 m CEP, 3.5 m SEP

Velocity[12]

0.1 m/s

Maximum horizontal velocity

310 m/s

Maximum vertical velocity

50 m/s

Physical

Chassis requirement

One 3U CompactPCI or PXI slot (PXI the system timing slot for full functionality)

Weight

186 g

Front panel connectors

Six SMB male, 50 Ω; one standard RJ-45 Ethernet connector

Front panel indicators

Two tricolor LEDs (green, red, and amber) for GPS and IEEE 1588 status, and two green/amber LEDs for Ethernet link status and speed

Recommended maximum cable lengths

PFI, DC to 1.5 MHz

200 m

CLKOUT to CLKIN[13]

200 m

Ethernet CAT5

100 m

Power Requirements

Voltage (V) Typical Maximum
+3.3 V 740 mA 1.86 A
+5 V 335 mA 1.14 A
+12 V 54 mA 175 mA
-12 V 24 mA 35 mA

Synchronization Accuracy

Test* Synchronization Performance
GPS ±40 ns, <8 ns standard deviation
IEEE 1588 3 m Ethernet direct connection ±25 ns, <4 ns standard deviation
IEEE 1588 through a 1588 switch‡,** ±40 ns, <8 ns standard deviation
IEEE 1588 through a hub‡,†† ±60 ns, <12 ns standard deviation
IEEE 1588 through a switch‡,‡‡ ±25 µs, <150 ns standard deviation
IRIG-B DC ±55 ns, <13 ns standard deviation
IRIG-B AM matching***,††† ±1.15 µs, <260 ns standard deviation
IRIG-B AM to source††† ±5 µs, <500 ns standard deviation
PPS ±40 ns, <8 ns standard deviation

*All synchronization performance figures are based on empirical results and represent typical behavior. All figures are obtained recording the offset between PPS signals generated by two PXI-6683 Series boards, inside a closed PXI chassis, configured to synchronize to the particular time reference, at ambient room temperature. Synchronization was performed for 15 minutes before PPS offset recording began. All test durations were at least 12 hours.

For the GPS test, two PXI-6683 Series boards were independently synchronizing to GPS and configured to generate a PPS. the specification above represents typical empirical results. Please note that GPS satellites are only guaranteed to be withing 100 ns of UTC. Therefore, the offset between any two devices synchronizing can be as high as 200 ns plus the offset of that device to GPS.

Sync interval of 1 second was used for IEEE 1588 tests, and all Ethernet connections were 1 Gbps unless otherwise specified.

**Hirschmann MAR1040 Gb 1588 switch used

††Netgear DS104 Hub used with 100 Mbps links

‡‡Airlink 101 Gigabit over copper switch used. For this test, a moderate amount of non-1588 Ethernet traffic was present on the switch.

***IRIG-B AM matching specification was obtained by setting two PXI-6683 Series boards to synchronize independently to the same IRIG-B AM source and generate a PPS. the offset between their PPS signals was then measured over a 12 hour period.

†††IRIG-B performance depends on IRIG-B source stability and quality.

Environmental

Operating Environment

Ambient temperature range

0 to 55 °C (tested in accordance with IEC-60068-2-1 and IEC-60068-2-2.)

Relative humidity range

10% to 90%, noncondensing (Tested in accordance with IEC-60068-2-56.)

Maximum altitude

2,000 m (at 25 °C ambient temperature)

Pollution Degree

2

Indoor use only.

Storage Environment

Ambient temperature range

-40 to 70 °C (Tested in accordance with IEC-60068-2-1 and IEC-60068-2-2.)

Relative humidity range

5% to 95% noncondensing (Tested in accordance with IEC-60068-2-56.)

1 When configured to route the on-board oscillator (TCXO) or PXI_CLK10, otherwise CLKOUT will be disabled (default).

2 When configured to route the on-board oscillator (TCXO) or PXI_CLK10, otherwise CLKOUT will be disabled (default).

3 Stresses beyond those listed can cause permanent damage to the device. Exposure to absolute maximum rated conditions for extended periods of time can affect device reliability. Functional operation of the device outside the conditions indicated in the operational parts of the specifications is not implied.

4 Applies to asynchronous routes from a single PXI_Star input to multiple PFI outputs.

5 For PFI 0 these characteristics apply when the line is configured as a digital input. They do not apply when configured as an IRIG-B AM input.

6 Stresses beyond those listed can cause permanent damage to the device. Exposure to absolute maximum rated conditions for extended periods of time can affect device reliability. Functional operation of the device outside the conditions indicated in the operational parts of the specifications is not implied.

7 The PXI-6683H does not have star trigger lines

8 Measured at the PXI-6683 Series backplane connector.

9 Compensating for quantization error

10 All SV at -130 dBm

11 24 hours static

12 All SV at -130 dBm

13 The PXI-6683H does not have a CLKIN connector.