The NI PXIe-2526 uses electromechanical armature relays.

Refer to the following tables for information about ordering replacement relays. Use relays of the same brand that you are replacing.

Relay Manufacturer Part Number
Tyco 1462043-6
Relay Kit Part Number
National Instruments (10 relays, Tyco) 782461-10

Complete the following steps to locate, remove, and replace a failed relay.

Locate the Relay

  1. Ground yourself using a grounding strap or a ground connected to your PXI Express chassis.
    Note   Properly grounding yourself prevents damage to your module from electrostatic discharge.
  2. Locate the relay you want to replace. Refer to the following figures and table for relay locations.

    NI PXIe-2526 PCB 1

    Table 3. NI PXIe-2526 PCB 1 Relay Locations
    Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator
    k0 K1 k16 K17 k32 K33 k48 K49 k64 K65 kcomhi K78
    k1 K2 k17 K18 k33 K34 k49 K50 k65 K66 kcomlo1w K79
    k2 K3 k18 K19 k34 K35 k50 K51 k66 K67 kcomlo K80
    k3 K4 k19 K20 k35 K36 k51 K52 k67 K68
    k4 K5 k20 K21 k36 K37 k52 K53 k68 K69
    k5 K6 k21 K22 k37 K38 k53 K54 k69 K70
    k6 K7 k22 K23 k38 K39 k54 K55 k70 K71
    k7 K8 k23 K24 k39 K40 k55 K56 k71 K72
    k8 K9 k24 K25 k40 K41 k56 K57 k72 K73
    k9 K10 k25 K26 k41 K42 k57 K58 k73 K74
    k10 K11 k26 K27 k42 K43 k58 K59 k74 K75
    k11 K12 k27 K28 k43 K44 k59 K60 k75 K76
    k12 K13 k28 K29 k44 K45 k60 K61 k76 K77
    k13 K14 k29 K30 k45 K46 k61 K62 k77 K81
    k14 K15 k30 K31 k46 K47 k62 K63 k78 K82
    k15 K16 k31 K32 k47 K48 k63 K64
  3. Locate the assembly and serial number labels on the board with the relay you want to replace. White labels indicate the board was assembled using lead solder (Sn 63 Pb 37). Green labels indicate the board was assembled using lead-free solder (Sn 96.5 Ag 3.0 Cu 0.5). Lead-free assemblies have assembly numbers ending in L.

Replace the Relay

Note   NI recommends using lead-free solder for relay replacement on lead-free assemblies, and lead solder for relay replacement on lead assemblies.
Caution   Do not rework lead assemblies using a lead-free work station. Lead solder from the unit could contaminate the station.
Caution   If a lead-free assembly is reworked with lead solder, label the assembly to indicate this. This can prevent the same unit from being reworked later on a lead-free solder station, which could contaminate the station.

Make sure you have the following:

  • Temperature-regulated soldering iron set to 316 °C (600 °F) for lead solder rework or 371 °C (700 °F) for lead-free solder rework
  • 63/37 Tin/Lead solder (flux core) for lead solder rework
  • 96.5/3.0/0.5 Tin/Silver/Copper solder (flux core) for lead-free solder rework
  • Solder wick
  • Fine pick
  • Isopropyl alcohol
  • Cotton swabs

Complete the following steps to replace a relay:

  1. Locate the assembly and serial number labels on the board with the relay you want to replace. White labels indicate the board was assembled using lead solder (Sn 63 Pb 37). Green labels indicate the board was assembled using lead-free solder (Sn 96.5 Ag 3.0 Cu 0.5). Lead-free assemblies have assembly numbers ending in L. The different label types are shown in the following figure.

  2. Replace the relay as you would any other through-hole part. Trim the replaced relay to no more than 0.41 mm (0.016 inch) from the PCB.
Tip   In NI-SWITCH 3.1 or later, you can use the Switch Soft Front Panel to reset the relay count after you have replaced a failed relay. Refer to the Switch Soft Front Panel Help for more information.